ccie security v5 written videos

ccie security v5 written videos

Set a user password or authentication protocol VTP has three modes : OSI seven-layer network model : Protocol data unit extended IP accesslist ( extended IP access list ) by logical address, the network layer protocol header word 1. Define the maximum number 2. Horizontal separation 3. Route poisoning , toxicity reversal 4. Silence timer 5. Trigger update ! The station's HDLC communication mode, where the transmission can start from the primary station or a secondary station. Port number : Provides the session layer to distinguish data without the application . Identity service . cable range ( range of cables ) in the extended AppleTalk network, the existing nodes on the network so that PPP 's own password configuration firewall ( firewall ) intentionally a barrier between any public network and a private network settings from a For broadcast frames and multicast data frames , the switch forwards flooding by default. The clock frequency Serial1 is up, the line protocol is up interface is working properly. 1. Neighbor table => all neighbors CD carrier detection (cairierdetect) indicates that an interface has been activated or a modem-generated connection The command gives the connection from the local router to the remote router. The snow users command displays the connection ID of the remote login to the local router user . 1. Use hop count as a metric 2. Support up to 6 paths for the average load (default set to 4) 3. Periodic notification time : 30s =========================================================== =============== The fixed length enables cells to be processed and exchanged in hardware at high rates, making this technology the basis for ATM and other high-speed network protocols. See cell . ATG Address Translation Gateway (Address Translation Gateway) ----- Cisco DECnet routing software is a mechanism that allows the router route multiple, independent DECnet networks and to establish a user-specified address into a network between the selected nodes. The bit, that is, a number cannot be divisible by 8 . Alignment errors are usually the result of frame corruption caused by conflicts. B(config)#inte s 1 administrative distance ( management distance ) from 0 to 255 a number between, which represents one routing information =========================================================== =============== =========================================================== =============== Circuit Switching : PPP, HDLC, SLIP UDP ( User Message Protocol ), no connection , no retransmission mechanism , unreliable transmission Control distribute VCC ( Control Distribution VCC) Phase I LAN simulation defines three control connections CPCS CPCS layer (Common Part Convergence Sublayer) two business discovery mode ( discoverable mode ) also called dynamic configuration, this technology is AppleTalk interface is used from Mesh Full ( full mesh ) network topology, wherein each node to other network nodes or virtual physical FDM frequency division multiplexing (Frequency-Division Multiplexing) allows several channels to the channel =========================================================== =============== FRAME-RELAY topology (pvc) 1. Switch and bridge 2. How many segments ( ports ) of switches and bridges have conflicting domains . BGP speaker (BGP speakers ) advertises its routing prefix or router. ++<6> + x =========================================================== =========== 1900 only supports ISL trunk protocol 2950 only supports 802.1Q trunk protocol 3550 supports 802.1Q and Interface fastethernet 0/1 enters Fast Ethernet 0/1 interface Righteousness. Network traffic is bridged across all interfaces of the same bridge group number. 1. The content of the announcement : a copy of the routing table (copy) 2. The time of the announcement : periodicity 3. The object of the announcement : the directly connected neighbor router Change information, a spanning tree protocol that sends initialization packets at definable intervals. binary ( binary ) by 1 and 0 two methods of counting characters. Binary count is made for all information Equipment and Tnter have jointly improved. Ethernet is similar to the TEEE802.3 family of standards and uses CSMA/CD to operate at lOMb/s rates on various types of cables . Also known as DIX (Digital/Intel/Xerox) Ethernet. See The CISCO 1900 series switches use free shard forwarding to forward this forwarding method by default. Freedom debris forwarding mechanism , can only CISCO achieve on the device . =========================================================== =============== End exit port configuration device algorithm ( algorithm ) to a set of rules or procedures to solve a problem. Algorithms in the network are generally used Configure a password for the console port : The protocol field, even the direct font size in the transport layer header, filters the IPX address table of the network . distance-vector routing algorithm ( Distance Vector Routing Algorithm ) In order to find the shortest path, DHCP Dynamic Host Configuration Protocol (Dynamic Host Configuration Protocol) ----- DHCP is Designated router (DR , designated router ) creates an OSPF for the LSA for a multiaccess network An example. Also known as " narrowband " . For broadband . CER cell error ratio (cell error ratio) ATM cell, a transmission error within a certain time and The device has the hardware address of all devices on the internetwork. The server will then dynamically allocate the used VLANs . The bit set in the frame when the frame relay network encounters a congestion path. Receiving a DTE with a BECN frame can require the advanced protocol to take the necessary flow control measures. Compare FECN . Configuration information. Displays a physical view of the CiSCO device chassis and provides device monitoring capabilities and basic troubleshooting capabilities. Can be integrated with a large number of SNMP- based network management platforms. Information can be used to determine if the network has recently caused a change in the problem. The process of OSPF creating neighbors : 1. Control network traffic 2. Implement packet filtering Floating routes ( floating routers ) are used along with dynamic routing to provide backup routes to prevent failure. De-encapsulation ( disassembly ) layered protocol technology,ccie security v5 written videos, in which a layer of slave layer protocol data unit Network connection. Flash ( flash )----- Electrically erasable programmable read only memory (EEPROM) . Used by default to save CiscoIOS on the router . ABR area border router ----- located in one or more OSPF area boundary OSPF routers, ABR is used to OSPF connection region to the OSPF backbone area =========================================================== ================ Free Fragment Forwarding (cisco private technology ): between pass-through forwarding and storage forwarding performance . Clock rate ? Configure the clock frequency of the DCE interface ( system specified frequency ) Show cdp neighbors to view CDP neighbors ( without IP) The fixed length enables cells to be processed and exchanged in hardware at high rates, making this technology the basis for ATM and other high-speed network protocols. See cell . switchport mode trunk change the interface mode to trunk mode of operation in 3550 to create an 802.1Q trunk road =========================================================== =============== R14(config)#isdn switch-type basic-net3 AS AS (autonomous system) a group of networks under the management of another, they share the same Acknowledgment ( acknowledgment ) is transmitted from one network device to another network device authentication, showed a Data link layer : data error detection , physical address MAC Frame A recognized serial interface processor that provides four or eight high-speed serial interfaces. Dynamic control of the measure, ACR varies between minimum cell rate (MCR) and peak cell rate (PCR) . See At least two non-adjacent AppleTalk network through an external network ( such as TCP / IP) is a connection establishment AppleTalk the WAN . This connection is called an AURP tunnel. By exchanging routing information between external routers, AURP maintains a routing table for the full AppleTalk WAN . See AURP tunneL . Expansion ( competition ) directs compressed data through an algorithm that restores the information to its original size. the Authorization ( authorization ) based on the AAA model of identity to allow access to a resource behavior verification. CSU channel service unit (channel service unit) connecting end-user equipment to a local digital telephone The sessions command gives the connection from the local router to the remote router. The snow users command displays the connection ID of the remote login to the local router user . The line is damaged , the interface does not have any connection cable. Serial1 is up, line protocol is down Port number : Provides the session layer to distinguish data without the application . Identity service . H channel (H channel ) high-speed channel (high-speed channel): a full-duplex, the 384Kb / s work on rate ISDN primary rate channel. See B channe , D channel , and E channel . the adjacency ( abutting ) the relationship between the neighboring routers and end nodes use a common media segment established to Adopt standard : 1. refuse 2. allowed administrative distance ( management distance ) from 0 to 255 a number between, which represents one routing information At least two non-adjacent AppleTalk network through an external network ( such as TCP / IP) is a connection establishment AppleTalk the WAN . This connection is called an AURP tunnel. By exchanging routing information between external routers, AURP maintains a routing table for the full AppleTalk WAN . See AURP tunneL . Address learnmng ( address learning ) is used with the transparent bridge to learn the hard of all devices on the internet. convergence ( convergence ) Internet in all routers update their routing tables and create a consistent Binding ( binding ) in LAN configuration on a network layer protocol to use some type of frame No port is activated with the no shutdown command An interface processor used by the device to provide two lOOMb/s lOOBaseT ports. Programmable after shipment, these non-volatile memory chips can be wiped off and reprogrammed with high power light when needed. See EEPROM and PROM . And track . 1 th D channels ( each 64Kb / s) a part in which a single channel or channel group are connected to different destinations, supports the DDR , Frame Relay, and the X.25 . Compare channelized E-1 . VTP is a messaging system . Ensures that all of the switches in the same management domain below network VLAN Any device connected between. See Cisco FRAD and FRAS . between. It is also the time it takes for a packet to travel from its source through a path to its destination. See latency . Demarc ( demarcation ) The demarcation point between the Customer Premises Equipment (CPE) and the telephone company carrier equipment. Telnet *.*.*.* is a telnet device . You need to set the password for line vty . If you need to enter privileged mode, you need to configure it. E channel (E channel ) loopback channel (Echo channel) ----- for a circuit switched 64Kb / s ISDN control channel. This channel may specifically described in 1984 in ITU-T ISDN find specification, but from the 1988 version canceled. See Bchannel , D channel H channel . The route to the network. Configure virtual loopback interface ( loopback interface defaults to UP state ) inerface loopback? Create a loopback interface Encapsulation frame-relay no shut Node group. A direct broadcast is indicated by its broadcast address, which is a destination subnet address where all bits are one . Caused by simultaneous transmission of the network segment. Its appearance may exhaust the network bandwidth and cause a timeout. 4. Notification method : Broadcast (RIPv1, IGRP) rule mechanism : Encapsulate the packet and prepare the data for transmission on the network medium. Session layer : Differentiate data from different applications . The operating system works on this layer of DATA Startup -config will be actively loaded every time the router or switch is started . ++<6> + x bursting ( burst ) Some technologies ( including ATM and FR ) are considered to be unexpected. This means the user Rip Version 2 : Thus, the switch has exited the switch at the leading edge of the output before the packet is fully entered into the input port. The frame will be read, processed, and forwarded immediately after the destination address of the frame is verified and the output port is determined. cofiguration register ( Configuration Register ) ----- in hardware or software stored in a 16 -bit value may be configurable, it is determined during initialization Cisco router functions. In hardware, the bit position is set using a jumper. In software, it is set by the specified special bit pattern. This bit pattern is configured by a hexadecimal value together with the configuration command. A(config)#key chain A configuration key chain A =========================================================== =============== The route to the network. Frame-relay route 110 interface Serial1 120 The law finds a word. The device relaxes the requirements for a feature ( such as latency ) and tries to find a path that meets the most important needs of a group. Hostname ABC configuration local username Show cdp neighbors detail View CDP neighbors ( including Layer 3 IP addresses ) show cdp entry * View CDP neighbors ( including Layer 3 IP addresses ) Ip address 1.1.1.1 255.0.0.0 Configure the IP address of the interface A(config)#key chain A configuration key chain A Frame-relay map ip 10.1.1.2 110 broadcast for manual static mapping One of the related AAL sublayers, which is further divided into CS and SAR sublayers. The CPCS prepares data for transmission over the ATM network, which creates a 48- byte payload cell that is sent to the ATM layer . See AAL and ATM layer . Network layer : routing ( path selection ), logical address (IP) Packet There are two types of ACLs : 1. Content of the announcement : Incremental update (OSPF lsa) 2. Announcement time : Trigger 3. Announced object : Router with neighbor relationship Congestion ( congestion ) exceeds the amount of network traffic handling capacity. AAL2 ATM Adaptation Layer ----- ITU-T 2 recommendations four AAL one , to support variable bit rate connection-oriented traffic, such as voice traffic see AAL Data link layer : data error detection , physical address MAC Frame boot sequence ( leader sequence ) define how routers boot. The configuration register tells the router where to go from Busy, a frame can be discarded. DE is a field in the frame that is opened by the sending router if the committed information rate (CIR) is over-provisioned or set to zero . coimnection ID ( connection ID) each into the router's Telnet identifying the session analysis. Show sessions CSU channel service unit (channel service unit) connecting end-user equipment to a local digital telephone The bit set in the frame when the frame relay network encounters a congestion path. Receiving a DTE with a BECN frame can require the advanced protocol to take the necessary flow control measures. Compare FECN . 1. Full mesh 2. Half mesh 3. Star and spoke DCE/DTE only exists in the WAN Frame-relay route 110 interface Serial1 120 AURP AppleTalk is based on the AppleTalk Update-based Routing Protocol, a technology for encapsulating AppleTalk traffic in the header of an external protocol. Floating routes ( floating routers ) are used along with dynamic routing to provide backup routes to prevent failure. Code, during each bit cell 0 with "01" indicates, an alternating Points "11" or "00" . FIG. The sending device must maintain a density of 1 in the AMI but is not independent of the data stream. Also called the alternating mark reverse of the binary code. Control B8ZS . See ones density . Network view, the process required to use the best possible path. No user data passed during convergence. Change information, a spanning tree protocol that sends initialization packets at definable intervals. BGP4 BGP Version 4 (BGPversion4) ----- versions of the most common on the Internet inter-domain routing protocol 4 . BRI Basic Rate Interface (Basic Rate Interface) facilitate cross-circuit between video, data and voice Ppp chap password cisco sends local password in CHAP mode The area of ​​the possibility of being discarded. Cells with CLP=0 are considered to be guaranteed traffic and cannot be discarded. A cell with CLP = 1 is considered to be an effortful traffic, which can be discarded when congested, submitting more resources to handle the guaranteed traffic. 100BaseTX is based on the IEEE 802.3U standard, 100BaseTX is wired using two pairs of UTP or STP Target : 172.16.3.1 Cheng. Rip V1 uses broadcast announcement broadcast address : 255.255.255.255 ITU-T standard. Currently BISDN uses ATM technology and SONET- based transmission circuits to provide 155Mb/s and . 1 E-Channelized ( channelization E-1) operate in 2048Mb / s access to a link, a 29 th B IGRP is a CISCO private routing protocol that can only be implemented and deployed on CISCO routers . Typically specified by the network administrator and used by routing protocols to compare different routes through an internetwork. The routing protocol uses the cost value to select the best path to a destination : the lowest cost identification best path. See routing metnC . End exit port configuration device The designated router is in case of failure. Exchange routing information between systems. Circuit Switching : PPP, HDLC, SLIP Frame Relay ( FR ) ----- the X.25 protocol ( a guaranteed unrelated packet relay data transmission techniques ) in a more effective alternative. Frame Relay is an industry-standard, shared, and best-effort switched data link layer package that provides multiple virtual circuits and protocols between connected mechanisms. 10.1.1.1/255.255.255.255 A technique that allows for more data. CDP Cisco Discovery Protocol (Cisco Discovery Protocol) Cisco proprietary protocol, used to tell the neighbor Enable password Set the plaintext enable password 3. Routing Table => Best Route bootstrap protocol ( Bootstrap Protocol ) is used to dynamically allocate IP addresses to the requesting client and gateway coprocessor connection-oriented ( connection-oriented ) to establish a virtual circuit data before any data transmission PAT configuration =========================================================== =============== EIGRP external routing management distance : 170 EIGRP internal routing management distance : 90 show ip eigrp neighbors to view EIGRP neighbors Interface Serial1 no ip address accounting ( statistics ) ----- AAA one of the three components. Statistics provide auditing and recording skills for security models =========================================================== =============== Frame-relay interface-dlci ??? Assign a specific PVC to this subinterface . ??? is the PVC number . Specify the idle IP of the address pool CO central office (central office) , all circuits in a certain area are connected here, is the subscriber line flash memory ( flash memory ) Intel developed and licensed to other A nonvolatile semiconductor memory used by the manufacturer Adapt to traffic or buried Extended Setup ( extended set ) used in the setting mode to configure the router, it is more than the basic setting mode B (config-if) #ip nat outside arranged S1 interface outside the network to a source internal address 192.168.1.10 translated into an external IP is 1.1.1.1 B (config) #ip nat inside source static 192.168.1.10 1.1.1.1 Use the range of numbers assigned. The value of the cable range can be a sequence of one or several consecutive network numbers. Node addresses are determined by their cable range values. ITU-T standard. Currently BISDN uses ATM technology and SONET- based transmission circuits to provide 155Mb/s and Show hosts shows the current hostname configuration =========================================================== =============== CRC cyclic redundancy check : A method of detecting errors in which a frame receiver uses a binary divider to divide the frame content for a calculation and store the remainder with the transmitting node in the frame. Value comparison. Compare checksum . The interconnected network acts as a virtual link through an external network ( such as TCP/IP) . See AURP . =========================================================== =============== byte-oriented protocol ( byte oriented protocol ) to mark the frame boundaries, the use of a user character Show frame-relay lmi show frame-relay pvc show frame-relay map Show ip access-lists to view specific list conditions and matching information ELAP EtherTalk Link Access Protocol (EtherTralk Link Access Protocol) on EtherTalk Network Frame-relay switching Source port : None 1. Transmission area ( backbone area ) 2. Common area ( non-backbone area ) Dynamic NAT configuration And make console configuration settings. CDP timer (CDP timer ) By default, Cisco Discovery Protocol is transmitted to all router interfaces. Config-register 0x2142 modify the startup configuration key interface fastethernet 0/1 enter fa0 / 1 interface Show history view history command ( command just used recently ) 1. Transmission area ( backbone area ) 2. Common area ( non-backbone area ) RA: Frame Relay ( FR ) ----- the X.25 protocol ( a guaranteed unrelated packet relay data transmission techniques ) in a more effective alternative. Frame Relay is an industry-standard, shared, and best-effort switched data link layer package that provides multiple virtual circuits and protocols between connected mechanisms. call admission control ( call admission control ) the ATM network device in a traffic management, it is a Which contains: BridgeID = Bridge Priority + MAC address Action : Deny Encryption ( encryption ) converting the information into a form clutter to effectively disguise, so as to prevent an authorized end A (config) #inte s 1 enters s 1 interface Network view, the process required to use the best possible path. No user data passed during convergence. In ABR service allows a congestion feedback mode. EFCI can be set by any network element in immediate or some kind of congestion state. The destination end system can perform a protocol that adjusts and lowers the cell rate of the connection based on the EFCI value. See ABBR . All-trans line (Rollback): for CISCO network equipment for the management . Router eigrp 100 Support for multiple network layer protocols through NCP can achieve " authentication ", " compression ", " error detection ", " multi-link " through LCP . Specify the idle IP of the address pool Externally connected to each interface of the device. This technology can be used by bridges and switches to transmit traffic over the network. =========================================================== =============== 1.cisco hdlc: can support multi-protocol environment , by adding the " attribute " field . 2.standard hdlc: only support single-protocol environment edge. When any member of the peer group wants to find a resource, it sends a probe to the border peer. The border peer then forwards the request on behalf of the requesting router, thus eliminating duplicate traffic. Port Auxiliary ( auxiliary port ) the Cisco console port on the router backplane, which allows the call routing Clear line * Force interrupt "telnet to local " session An octet divided into four points, followed by a forward slash and the number of the masked bit ( abbreviation of the subnet symbol ) . See Show ip ospf interface serial 1 View the process ID of RouterID and OSPF and the associated network type . show ip protocols EIGRP uses a wildcard mask configuration example : Bridge ( bridge ) two devices connected to the network and transmit data packets therebetween. Both paragraphs must use the same DDP Datagram Delivery Protocol (Datagram Delivery Protocol) for the AppleTalk protocol as Group The BPDU is exchanged between switches every two seconds. Periodic. The packet's ability to process packets faster. Bandwith on demand (BoD , bandwidth on demand ) This feature allows an additional B channel to be used for VLAN; all switches in the end-to-end \VLAN understand all configured VLANs . End-to-end VLANs are configured to allow membership based on functions, projects, departments, and so on. Router eigrp 100 Telnet: Multi-person remote management ( depending on performance , number of VTY lines ). Not safe . Ping 1.1.1.1 detects the validity of the interface The pick-up point is specified in the destination field of the packet. See SSAP and SAP . =========================================================== =============== Layer , Presentation layer , Session layer , and Transport layer . data terminal equipment ( Data Terminal Equipment ) , see the DTE . The default route ( default route ) is used to guide the static routing table entry of the frame, and its next hop is not in The sessions command gives the connection from the local router to the remote router. The snow users command displays the connection ID of the remote login to the local router user . 1.Server mode < main > 2.Client mode < time > 3.TransParent mode < transparent > The header information is removed from the (PDU) . See encapsulatio . =========================================================== =================== 10Gbps 2 1OOBaseT is based on the IEEE 802.3U standard, 1OOBaseT is a baseband fast Ethernet using UTP wiring The header information is removed from the (PDU) . See encapsulatio . 1.Server mode < main > 2.Client mode < time > 3.TransParent mode < transparent > Network 192.168.1.0 0.0.0.3 access rate ( access speed ) ----- bandwidth rate defined circuit. For example, the access rate of the T-1 circuit is Endpoints ( endpoint ) see BGP neighbors . cofiguration register ( Configuration Register ) ----- in hardware or software stored in a 16 -bit value may be configurable, it is determined during initialization Cisco router functions. In hardware, the bit position is set using a jumper. In software, it is set by the specified special bit pattern. This bit pattern is configured by a hexadecimal value together with the configuration command. Collision ( conflict ) Ethernet two nodes simultaneously transmit the result of the transmission. When they are on physical media COmposite metric ( complex metrics ) with IGRP and EIGRP use with such routing protocol, If the router does not store the loopback , select the highest IP from the physical interface as the RouterID (the interface must be active ) Holdtime CDP (CDP hold time ) routers to keep from neighboring routers received Cisco Discovery Protocol The destination hardware address of a frame, then look up the address in the filter table established by the switch, and then only send the frame to the port of the found hardware address, and the other ports cannot see the frame. Expansion ( competition ) directs compressed data through an algorithm that restores the information to its original size. Righteousness. Network traffic is bridged across all interfaces of the same bridge group number. Show interfaces fastethernet 0/1 switchport 1. CISCO 2. ANSI 3. Q993A De-encapsulation ( disassembly ) layered protocol technology, in which a layer of slave layer protocol data unit 1. Router 2. Routing implementation path selection ( routing decision ). Routing Table 3. WAN access . 4. Router broadcast domain division ( interruption ). A corrective technique used to block the request. The path is restored to an intermediate node. Then use GCAC to try to find an alternate path to the final destination. Transport layer : reliable and unreliable transport services , retransmission mechanism . Segment 16 , 32 , 64 and 128 are used. The defined length includes a 5- byte header and a 48- byte payload that identify the stream of the cell . See data direct VCC ( data direct VCC) ATM two LEG to establish a two-way point between the 1. Static NAT 2. Dynamic NAT 3. PAT Banner motd [char c] also ends with [char c] another line ----- s1 RA s0 >-------- s1 RB s0 --------- s1 RC s0 ------ Bridge ( bridge ) two devices connected to the network and transmit data packets therebetween. Both paragraphs must use the same Connect the SDLC device to Frame Relay without the need for an existing LAN . It is also possible to upgrade to a full-featured multi-protocol router. The conversion from SDLC to Ethernet and Token Ring can be activated , but the attached LAN is not supported . See FRAD . =========================================================== =============== Target port : 23 0x1 Router will load the mini ios software and enter BOOT mode. The ISDN interface for communication , which consists of two B channels ( each 64 Kb/s) and one D channel (16 Kb/s) . Compare PRT . See BISDN . CBR constant bit rate ----- ATM forum created for use in ATM networks Network 192.168.1.0 0.0.0.3 Numbered recommended standards in ISDN , SMDS, and BISDN . 2) A flag for the field in the ATM address containing the E.164 format number . A(config)#key chain A configuration key chain A Dynamic NAT configuration The process number does not affect the OSPF notification learning Enable password Set the plaintext enable password The other party is not configured with the same Layer 2 protocol serial interface default encapsulation: HDLC Externally connected to each interface of the device. This technology can be used by bridges and switches to transmit traffic over the network. It uses two pairs of twisted-pair cable (3 class 4 class or 5 classes ) , one pair for transmitting data to the other for receiving data. Broadcasting is not supported by FRAME-RELAY , which will cause the route to be unadvertised . Solution : Copy multiple frames for announcement. AFP AppleTalk Filing Protocol (AppleTalk Filing Protocol) a presentation layer protocol support In the network, the link access protocol formed on the standard Ethernet data link layer. 1. Reduce the size of the routing table 2. Speed ​​up the convergence 3. Limit the spread of LSA 4. Improve stability The path is activated on an analog modem. Dynamic NAT configuration If the router does not store the loopback , select the highest IP from the physical interface as the RouterID (the interface must be active ) Encapsulate the packet and prepare the data for transmission on the network medium. Ip route 4.0.0.0 255.0.0.0 2.0.0.2 Spanning tree port A connectionless protocol responsible for sending datagrams over an internetwork. Each non-root bridge elects a root port 1) Bandwidth Cost Lowest 2) Recevied BridgeID Lowest Note : The PPP protocol is defined in RFC 1378 . See PPP . Ping 1.1.1.1 detects the validity of the interface excess rate ( over rate ) in the ATM network, a connection over the insurance rate traffic. super It enables two socket (Socket) can be reliably performed between transactions, wherein a request for another execution of a given task and to report the results. ATP grabs both the request and the response, ensuring that the request - response is exchanged without loss. In attenuation ( attenuation ) communication, the weakening or loss of signal energy, usually caused by distance. =========================================================== =============== CiscoView GUI management software for Cisco network devices that provides dynamic status, statistics, and full OSPF open protocol , is link-state type routing protocol . Router rip selection rip as the routing protocol Programmable after shipment, these non-volatile memory chips can be wiped off and reprogrammed with high power light when needed. See EEPROM and PROM . Exit Scalability and improved performance and usability enhancements. Interface fa0/24 all-routes explorer packet ( full routing packet detection ) a can pass over the entire SRB sounding packet network, Enable password Set the plaintext enable password Line conosle 0 to consolo 0 Router eigrp 100 DLSw+ Cisco 's DLSw implementation supports the RFC standard, and Cisco added the goal to increase Telnet *.*.*.* is a telnet device . You need to set the password for line vty . If you need to enter privileged mode, you need to configure it. VTP is the use multicasting to advertise, VTP will intervals . 5 minutes announcement once , even if there is no change .VTP switch synchronized the last configuration . Frame Relay switching ( Frame Relay switching ) service provider router frame relay packets provided =========================================================== =============== At least two non-adjacent AppleTalk network through an external network ( such as TCP / IP) is a connection establishment AppleTalk the WAN . This connection is called an AURP tunnel. By exchanging routing information between external routers, AURP maintains a routing table for the full AppleTalk WAN . See AURP tunneL . Free Fragment Forwarding (cisco private technology ): between pass-through forwarding and storage forwarding performance . choke packet ( packet that was blocked ) when congestion exists, it is sent to the sender of a packet, it should inform 10Mbps 100 Topology Bus ( bus topology ) a straight LAN off-line structure, wherein transmission from each station on the network Immediate execution , immediate effect routing Classless ( stepless routing ) transmits routing update routing subnet mask. Stepless road IGRP is a distance vector type routing protocol that does automatic route summarization . There is no way to turn off this feature . =========================================================== =============== Router), also known as boot mode , can be used for IOS upgrades. =========================================================== ================ EIGRP external routing management distance : 170 EIGRP internal routing management distance : 90 show ip eigrp neighbors to view EIGRP neighbors Copy tftp: running-config copy startup-config tftp: It is responsible for transmitting frames. Compared to byte-oriented protocols, bit-oriented protocols are more efficient and reliable full-duplex operation. Compare byte-oriented protocol . A remote AppleTalk location access protocol for resources and data. 1.0.0.0 2.0.0.0 3.0.0.0 4.0.0.0 A(config-if)#ip rip authentication mode md5 ciphertext authentication Vlan database enters vlan configuration mode vtp domain configures VTP domain name vtp password configures VTP password B(config-if)#ip nat outside configure S1 interface for the outside network to specify which hosts can NAT explorer packet ( probes ) of a transmission source of the token ring devices SNA packet for a source found The node automatically performs the diagnosis and attempts to reconfigure the network by bypassing the failed area. The technology of connecting bandwidth on a line to allocate bandwidth. See TDM , ATDM, and statistical multiplexing . A LAN standard that can run at speeds up to 200 Mb/s and use token transfer media access technology on fiber optic cable. For redundancy, a double loop structure can be used. Port Console ( control port opening ) the Cisco a typical routers and switches on the RJ-45 ports, with Using private IP addresses host , you can not directly access the public network (Internet) private IP public network router will not appear in the routing table . EXEC session (EXEC session ) is used to describe a command line interface Cisco terminology. EXEC session exists Direct forwarding : fast , but can not ensure the correctness of the forwarded frame . The over rate is the maximum rate minus the insurance rate. Depending on the availability of network resources, excess traffic can be dropped during congestion. Contrast maximumraten =========================================================== =============== CCNA is Cisco's most basic entry certification. Among them, the test focuses on network concepts and theories. For beginners, many professional English terms are difficult to understand, which makes the students' learning progress difficult. The original textbook of CISCO series certification, the frequency of professional vocabulary appears, as long as the candidates are familiar with this article, I believe that learning will definitely do more with less.