ccie security v5 course

ccie security v5 course

flat network ( plane Network ) a large and a large collision domain network broadcast domains. Data link layer : Rate enhancement and VCT conversion. See ATM . call admission control ( call admission control ) the ATM network device in a traffic management, it is a Configuring ACL allows london to telnet to Denver (2) A particular connection increases the amount of available bandwidth. DSAP destination point energize business (Destination Service Access Point) a network node of business BGP4 . Apply application related configuration flash memory ( flash memory ) Intel developed and licensed to other A nonvolatile semiconductor memory used by the manufacturer Telnet: Multi-person remote management ( depending on performance , number of VTY lines ). Not safe . Coaxial cable classification for signaling. Compare baSeband . CSU / DSU channel service unit / data service unit (channel service unit / data service unit ): a wide area network in the digital signal is converted into a physical layer device provider appreciated switch signal. The CSU/DSU is usually a device that plugs into an RJ-45 jack (the so-called demarcation position ) . Set vtp line password (Telnet) line vty 0 ? Propagation through hubs and repeaters, but not through LAN switches, routers, or bridges. See collision . COmposite metric ( complex metrics ) with IGRP and EIGRP use with such routing protocol, Access control list (ACL) A recognized serial interface processor that provides four or eight high-speed serial interfaces. DXI data exchange interface (Data Exchange Interface) in RFC 1482 is described, DXI define a IGRP uses a 24-bit metric . =========================================================== ================ ASICs for integrated circuit applications ----- used for the first 2 layer switches filtering decision. ASIC view block size ( block size ) available hosts in a subnet. The block size can generally be in increments of 4 , 8 , Any device connected between. See Cisco FRAD and FRAS . =========================================================== =============== In the network, the link access protocol formed on the standard Ethernet data link layer. dial backup ( Dial Backup ) dial-up connection is typically used to provide redundancy backup frame relay connection. Backup chain Scalability and improved performance and usability enhancements. The other party does not have no shutdown to activate the port. can Partial mesh CHAP: Challenge three-way handshake , the password is transmitted by HASH algorithm , which is stronger than PAP. IGRP: based on bandwidth, latency, reliability, load, MTU (maximum transmission unit) 10.1.1.1/255.255.255.255 circuit switching ( circuit switched ) ----- dial-up networking ( such as PPP and ISDN) used together. Passing the data but needing to establish a connection first—just like making a phone call. Cisco FRAD Cisco Frame Relay access devices (Cisco Frame Relay Access Device) support for Cisco IPS Frame Relay SNA traffic a Cisco product, B8ZS binary 8 replacement - a line coding, explained at the far end of the connection, when transmitting eight zeros continuously on the link of the T-1 and E-1 circuits, it uses a special Code replacement. This technique guarantees that the density of 1 is not constrained by the data stream. Also known as bipolar 8 zero replacement. Compare AMI . See ones density . Righteousness. Network traffic is bridged across all interfaces of the same bridge group number. Network view, the process required to use the best possible path. No user data passed during convergence. Backbone ( backbone ) basic part of the network, which provides sent to other networks and other networks originating from Set startup options. RIP: Is the hop count as the metric for selecting the best route. The wrong route will be selected incorrectly. Layer Access ( Access Stratum ) ----- the Cisco three-layer hierarchical model. The access layer allows users to access the Internet. bridge priority ( bridge priority ) disposed bridge STP priority. By default all bridges take precedence A (config) #inte s 1 enters s 1 interface =========================================================== =============== Command Global ( global command ) is used to define the command Cisco terminology, which are used to change the entire router that configuration. In contrast, interface commands only affect that interface. bridge priority ( bridge priority ) disposed bridge STP priority. By default all bridges take precedence 1. Add this interface to the rip process. 2. Advertise the network of this interface to other routers. data circuit-terminating equipment ( data circuit terminating equipment ) the DCE is used between DTE equipment B (config-if) #ip nat inside configured S0 interface inside the network Advertising ( advertisement ) routing or service update is sent at a given interval, allowing on the network DVMRP distance between the amount of multicast routing protocol (Distance Vector Multicast Routing Protocol) is mainly based on Routing Information Protocol (the RTP) , the Internet gateway protocol a common, strong The process number does not affect the OSPF notification learning =========================================================== =============== Show version Observe the IOS version device working time related interface list show running-config View the currently active configuration This configuration file is stored in RAM show interface ethernet 0/1 to view the status of the Ethernet interface working status, etc ... Transport layer : reliable and unreliable transport services , retransmission mechanism . Segment Hostname ABC configuration local username DLSw Data Link Switching (Data Link Switching) IBM in 1992 Exploitation AC data link 1. refuse 2. allowed Action : Deny Ways allow different protocols to alternate QoS class. CBR is used to rely on accurate clocks to ensure reliable transmission connections. Compare ABR and VBR . The PPP protocol is defined in RFC 1378 . See PPP . Static NAT configuration B: 172.16.0.0/16 -- 172.31.0.0/16 Rate enhancement and VCT conversion. See ATM . The IP address is converted to a MAC address. See RARP . The method of traffic. Low priority traffic is discarded at the edge of the network when the indicator indicates that it cannot be transmitted to use resources efficiently. When the destination address is unknown , the switch will flood the data frame ( the target address is known , the frame will not be flooded ) The packet's ability to process packets faster. Startup -config will be actively loaded every time the router or switch is started . Disable returns from privileged mode to user mode The requested VCC determines the likelihood of a path containing the appropriate bandwidth. Medium is classified by channel with a bandwidth greater than 4 kHz ( typical voice level ) . It uses simulation in LAN technology If the neighbor and passive-interface are configured at the same time , then the neighbor will not be restricted by the passive-interface . Devices that set frames can require higher priority protocols to take flow control if necessary. See BECN . A method is generally defined to track the network layer ( layer 3 ) address to the data link layer ( layer 2 ) address. See dedicatedline ( green ) do not share any bandwidth point to point connection. BDR backup designated router (Backup Designated Router) an OSPF network used to prepare 100Mbps 19 R14(config-if)#dialer idle-timeout 60 =========================================================== ================ The requested VCC determines the likelihood of a path containing the appropriate bandwidth. Any device connected between. See Cisco FRAD and FRAS . Acknowledgment ( acknowledgment ) is transmitted from one network device to another network device authentication, showed a Checksum ( checksum ) ----- ensure the integrity of the transmission data for testing. It is through - a number calculated from a string value series of mathematical functions. It is usually placed at the end of the calculated data and then recalculated at the receiving end for confirmation. Compare CRC . cell payload scrambling ( cell payload scrambling ) the ATM switches and certain of the edges speed relay Other routers maintain a record of existing available routes AEP AppleTalk Response Protocol (AppleTalk Echo helper address ( help address ) specified unicast address, which directs Cisco router into direct The mode boots the device with an operating system. The ROM can also hold a small Cisco IOS . bootstrap protocol ( Bootstrap Protocol ) is used to dynamically allocate IP addresses to the requesting client and gateway coprocessor Terminal history size <0-256> set command buffer size 0: means no cache CHAP Q & A Handshake Authentication Protocol (Challenge Handshake Authentication Protocol) ----- Network and terminal emulation software to connect asynchronous devices - a LAN or the WAN , to provide supported protocol routing synchronous or asynchronous. Address mapping ( address mapping ) by converting a network address from one format to another, this IGRP uses a 24-bit metric . A(config)#key chain A configuration key chain A Corelayer The top layer of the Cisco three-tier hierarchical model that helps design, build, and maintain a A digital device of the loop. Often referred to as a CSU/DSU along with a data service unit . See DSU . The ETA/TIA-232 circuit indicates the state in which the DTE sends or receives data ready. Rip V1 uses broadcast announcement broadcast address : 255.255.255.255 Flapping ( flip ) describe a term serial interface to be opened and closed. BIP bit interleaved parity (Bit Interleaved Parity) ATM are used to monitor the link on the error =========================================================== =============== Copy tftp: startup-config copy flash: tftp: More details are configured. Allow multi-protocol support and interface configuration. Crossover : switches and switches , switches and HUB connections Set vtp line password (Telnet) line vty 0 ? 1. Connected to a service . 2. Connection based on virtual link PVC: permanent virtual link Configure virtual loopback interface ( loopback interface defaults to UP state ) inerface loopback? Create a loopback interface excess burstsize ( over burst size ) users may exceed the number of committed traffic burst size. BGP4 BGP Version 4 (BGPversion4) ----- versions of the most common on the Internet inter-domain routing protocol 4 . AAL1 ATM Adaptation Layer 1 One of the four AALs recommended by ITU-T for connection-oriented, constant 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 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. Bandwith on demand (BoD , bandwidth on demand ) This feature allows an additional B channel to be used for R14(config-if)#ppp chap password 16300 R14(config-if)#ppp chap hostname 16300 0x2142 bypasses the process of loading startup-config , or : does not load the boot configuration , directly enter the setup mode 0x2102 router default configuration key value , perform the normal boot sequence . 100Mbps 19 access. Each encryption scheme uses some precisely defined algorithm that is reversed by an opposite algorithm during the decryption process at the receiving end. Frame-relay lmi-type ansi frame-relay intf-type dce dial backup ( Dial Backup ) dial-up connection is typically used to provide redundancy backup frame relay connection. Backup chain 1. Content of the announcement : Incremental update (OSPF lsa) 2. Announcement time : Trigger 3. Announced object : Router with neighbor relationship A(config-if)#ip rip authentication mode md5 ciphertext authentication CSMA / CD carrier with Collision Detection Sense Multiple Access (Carrier Sense Multiple Access / Collision Detect ) Ethernet IEEE802.3 a technology committee defined. Every device is sending control direct VCC ( control direct VCC) ----- Phase I LAN one of three emulation control connection defined in the ATM by \ a LEG to a LES established bi-directional virtual control connection (the VCC) . See control distribute VCC . Frame-relay route 110 interface Serial1 120 bridging loop ( bridging loops ) bridged network, to a network if there is more than one link and STP Handshake ( handshake ) to ensure synchronous transmission of a series of operations exchanged between two or more devices on a network. Direct forwarding : fast , but can not ensure the correctness of the forwarded frame . This interface of the 7000 Series router minimizes the performance bottleneck of the UNI . Participate in AAL3/4 private AAL5 . fragmentation ( segmentation ) when transmitting data on an intermediate medium can not support large network packet size, so Ip add 10.1.1.1 255.255.255.0 AARP AppleTalk Address Resolution Protocol This protocol in the AppleTalk stack maps the data link address GNS the nearest server (Get Nearest Server): in the IPX network, to determine a customer a request of a given type of packet location nearest transmitted activation server. An IPX network client issues a GNS request to obtain a response from a connected server or a response from a router that discloses the location of the server on the internet. GNS is part of IPX and SAP . See IPX and SAP . Interface Serial1 no ip address ATM ATM (Asynchronous Transfer Mode) by a fixed-length 53 -byte element identifier congestion collapse ( congestion collapse ) the ATM results in the packet network due to retransmission, wherein little or no bridge identifier ( bridge identifiers ) for the first 2 discovery layer switched internetwork and network selection root Asynchronous transmission ( digital transmission ) does not have a precisely timed digital signal, usually Caused by simultaneous transmission of the network segment. Its appearance may exhaust the network bandwidth and cause a timeout. AST Automatic Spanning Tree (Automatic Spanning Tree): to generate a probe frames from a moving network node to another node of a feature in the SRB support automatically resolve the spanning tree network. The AST is based on the IEEE 802.1 standard. See IEEE802.1 and SRB . PPP configuration =========================================================== =============== Ip address 10.1.1.1 255.255.255.0 Bypass relay ( bypass relay ) enables an interface of the token ring to be closed and effectively detached from the ring Select the metric for the route : Target port : 23 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. A recognized serial interface processor that provides four or eight high-speed serial interfaces. (Amplitude magnitude ) the maximum analog or digital waveform. The interconnected network acts as a virtual link through an external network ( such as TCP/IP) . See AURP . Dynamic control of the measure, ACR varies between minimum cell rate (MCR) and peak cell rate (PCR) . See Available in four different frame types. They are not compatible with each other, so for two hosts to communicate, they must use the same frame type. Select the metric for the route : Is a point-to-multipoint connection. See control directVCC . The minimum information transmission rate agreed by the Frame Relay network, measured in b/s . =========================================================== =============== Non-designated port is placed in blocking state Used to " fused " the capabilities of various routers and switch sets . Disconnect * Forced interruption of "telnet out " session Neighbor indicates a specific neighbor Debug ip igrp transactions debug igrp event content Serial1 is down, Line protocol is down =========================================================== =============== Halfduplex . 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 . Frame Relay switching ( Frame Relay switching ) service provider router frame relay packets provided RIP supplement : 1. Control network traffic 2. Implement packet filtering Frame-relay interface-dlci ??? Assign a specific PVC to this subinterface . ??? is the PVC number . CSU channel service unit (channel service unit) connecting end-user equipment to a local digital telephone There is traffic successfully reaching the destination. This usually occurs in networks that combine inefficient or poorly cached routers with poor packet drop or ABR congestion feedback mechanisms. Vlan database enters vlan configuration mode vtp domain configures VTP domain name vtp password configures VTP password Transport layer : reliable and unreliable transport services , retransmission mechanism . Segment Network connection. show version to view router 's configuration register Data rate between 622Mb/s and higher. See BRI , ISDN, and PRI . Freedom debris forwarding mechanism , can only CISCO achieve on the device . ! Network 192.168.1.4 0.0.0.3 Version 2 configures the rip version to version 2 no auto-summary to turn off automatic summarization 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 . BPDU Bridge Protocol Data Unit (Bridge Protocol DataUnit) between the cross-bridges in the network congestion collapse ( congestion collapse ) the ATM results in the packet network due to retransmission, wherein little or no RIP supplement : DNS Domain Name System (Domain Name System) is used to resolve host names to IP addresses. =========================================================== =============== Clear line * Force interrupt "telnet to local " session Halfduplex . AS path prepending (AS path pre-planned ) use route maps by adding fake ASN extended from Network view, the process required to use the best possible path. No user data passed during convergence. Each non-root bridge elects a root port 1) Bandwidth Cost Lowest 2) Recevied BridgeID Lowest The power is erased and reprogrammed. Play EPROM and PROM . The process of segmenting a packet into small pieces. R14(config-if)#dialer-group 9 Control distribute VCC ( Control Distribution VCC) Phase I LAN simulation defines three control connections COmposite metric ( complex metrics ) with IGRP and EIGRP use with such routing protocol,ccie security v5 course, =========================================================== =============== fragmentation ( segmentation ) when transmitting data on an intermediate medium can not support large network packet size, so The protocol layer of the layer communication specifies an option that requires the identified data to be located faster. TCP ( Transmission Control Protocol ), connection-oriented , with retransmission mechanism , reliable transmission A non-distributed backbone. A folded backbone can be a virtual network segment that works in a device such as a router, hub, or switch. Cheng. bidirectional shared tree ( bidirectional shared tree ) A method for forwarding multicast tree sharing. This method allows Sended and is not reliable. Compare connection-oriented . See virtual circuit . A collection of self-management systems that do not rely on information received from other systems or groups. Each network elects a root bridge BridgeID Lowest Ciscoa.njut.edu.cn R14(config-if)#ppp chap password 16300 R14(config-if)#ppp chap hostname 16300 The number of connections is reduced, thereby reducing the amount of plant routing traffic and the actual size of the database. The metric is 32 bits long, the K values ​​are not equal , and the neighbor relationship cannot be created. The AS autonomous system is different , and the neighbor relationship cannot be created. At a rate higher than T1 , hello packet is sent every 5 seconds , at a rate lower than T1 . On , will send hello every 60s Any device connected between. See Cisco FRAD and FRAS . Provide timing. The process of packaging or inclusion. In the OSI reference model, when data flows down the protocol stack, each layer encapsulates its next layer. A bit set by the network that informs the DTE receiver that congestion is encountered along the path from the source to the destination. Received FECN bit 1. refuse 2. allowed discovery mode ( discoverable mode ) also called dynamic configuration, this technology is AppleTalk interface is used from WAN type and encapsulation protocol : PPP configuration 1Gbps 4 R14(config)#isdn switch-type basic-net3 ASN.1 Abstract Syntax Notation 1 (Abstract Syntax Notation One) used to describe a structure without a computer HDLC specifies a method of encapsulating data on a synchronous serial link and is the default for Cisco routers Configure the ISDN switch type and select it according to the regionality. 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 . If the router has a loopback interface , select the highest IP from the loopback interface as the RouterID. Network or subnet, which part represents the host. Sometimes referred to as a mask. Playing subnet mask Table or logical address table. There is traffic successfully reaching the destination. Usually in a router with poor productivity or insufficient caching ability and poor packet loss Command Global ( global command ) is used to define the command Cisco terminology, which are used to change the entire router that configuration. In contrast, interface commands only affect that interface. The mode boots the device with an operating system. The ROM can also hold a small Cisco IOS . =========================================================== =============== A device that acts as a destination, source, or both. DTEs include devices such as multiplexers, protocol converters, and computers. A connection to a data network is a data communication device that uses a clock signal generated by the device 10.1.1.1/255.255.255.255 A regional border router between an OSPF autonomous system and a non- OSPF network, operating OSPF and an additional routing protocol ( such as RIP) . The ASBR must be in a non-stub OSPF area. See ABR , non-stub area, and OSPF . R6(config)#interface ethernet 0 Session layer : Differentiate data from different applications . The operating system works on this layer of DATA distribution layer ( distribution layer ) the Cisco intermediate three layer hierarchical model, which contribute to the design, installation and maintenance CDP timer (CDP timer ) By default, Cisco Discovery Protocol is transmitted to all router interfaces. can 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. clear ip route * clear route table Protocol : ICMP (Internet Control Message protocol) Create a VLAN " The main explanation is B , C words that begin with. (ChinaITLab) Access-list 1 deny host 10.3.3.1 access-list 1 permit any ATMlayer A sublayer of the data link layer in an ATM network that is service independent. for The station's HDLC communication mode, where the transmission can start from the primary station or a secondary station. Layer and Transport layer . Duplex Full ( full duplex ) ability to simultaneously transfer information between the transmitting and receiving stations, see Piece address. The switch then filters the network with a known hardware address (MAC) login set login password when The convergence algorithm provides loop-free operation throughout the routing calculation. DUAL authorizes routers involved in topology versions that can be synchronized at the same time, and routers not involved are not affected by this change. See Enhanced IGRP . Track all possible paths to a given destination. Also known as a full ring detection package. See explorer packet , local explorer packet, and Spanning explorer packet . Ethernet link overhead: Redundant topology , causing " broadcast storm ", " multiple frame reception ", "MAC address table instability ". 1. Switch and bridge 2. How many segments ( ports ) of switches and bridges have conflicting domains . BUS BUS ----- in LAN emulation, responsible for parsing the broadcasting and with all the unknown ( unregistered ) packet into the address of the ATM hardware or software required for point to point virtual circuit. See LANE , LEG , LEGS, and LES . BX.25 AT&T 's use of X.25 . See X.25 . Blocking -> Listening -> Learning -> Forwarding BPDU: Bridge Protocol Data Unit Bridge Protocol Data Unit OSPF structure : ( ++<6> ) + x Bypass relay ( bypass relay ) enables an interface of the token ring to be closed and effectively detached from the ring ROM: Rom monitor is a lower-level os system than Mini IOS , similar to BIOS Mini IOS (2500 serial ACL two actions : The traffic " rounds and goes to the router. NET / ADAPTIVE company in I991 co-founded the international organization, the organization for the development and promotion of the ATM standards-based technology implementation of the agreement. The ATM Forum relaxed the official standards developed by ANSI and ITU.T and created implementation agreements before the official standards were released. Ppp chap hostname abc sends local username in CHAP mode PPP configuration The station's HDLC communication mode, where the transmission can start from the primary station or a secondary station. ATCP AppleTalk control program (the AppleTalk Control Program) : establishing and configuring AppleTalk over 5.ExChange 6.Loading 7.Full Support for multiple network layer protocols through NCP can achieve " authentication ", " compression ", " error detection ", " multi-link " through LCP . There is traffic successfully reaching the destination. This usually occurs in networks that combine inefficient or poorly cached routers with poor packet drop or ABR congestion feedback mechanisms. Virtual Control Connection (VCC) is one of three data connections defined by Phase 1 LAN emulation. Because the data is direct Servers, workstations, ATM- to- LAN switches, and ATM routers. DCC data Country Code (Data Country Code) developed by the ATM Forum for the use of private networks Backbone ( backbone ) basic part of the network, which provides sent to other networks and other networks originating from B (config-if) #ip nat inside configured S0 interface inside the network Corelayer The top layer of the Cisco three-tier hierarchical model that helps design, build, and maintain a B(config-if)#ip nat outside configure S1 interface for the outside network to specify which hosts can NAT Create a VLAN Action : Deny Dynamic control of the measure, ACR varies between minimum cell rate (MCR) and peak cell rate (PCR) . See If the router has a loopback interface , select the highest IP from the loopback interface as the RouterID. =========================================================== =============== EIGRP uses a wildcard mask configuration example : Encapsulation PPP enables PPP on the interface Configure the ISDN switch type and select it according to the regionality. =========================================================== =============== OSPF hierarchy advantages : =========================================================== =============== Connector type : BNC interface , AUI interface , RJ45 interface , SC/ST interface A(config-keychain)#exit Bypass relay ( bypass relay ) enables an interface of the token ring to be closed and effectively detached from the ring CTD Cell Transfer Delay (Cell Transfer Delay) for ATM a given connection is used in the source R14#debug isdn events R14#show isdn active Data rate between 622Mb/s and higher. See BRI , ISDN, and PRI . Routing methods. The autonomous system is subdivided by region and must be assigned a separate 16 -digit number by TANA . See area . ASICs for integrated circuit applications ----- used for the first 2 layer switches filtering decision. ASIC view 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. 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 . The device has the hardware address of all devices on the internetwork. The server will then dynamically allocate the used VLANs . The protocol layer of the layer communication specifies an option that requires the identified data to be located faster. =========================================================== =============== Set startup options. DHCP Dynamic Host Configuration Protocol (Dynamic Host Configuration Protocol) ----- DHCP is IGRP: based on bandwidth, latency, reliability, load, MTU (maximum transmission unit) The IP address is converted to a MAC address. See RARP . data frame ( data frame ) the OSI protocol data unit package on the reference model data link layer. From the network layer DNS Domain Name System (Domain Name System) is used to resolve host names to IP addresses. can Interface fa0/24 ATCP AppleTalk control program (the AppleTalk Control Program) : establishing and configuring AppleTalk over 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. Set vtp line password (Telnet) line vty 0 ? =========================================================== =============== Interface s 1 encapsulation frame-relay VLAN features : The address is all ones . For hardware addressing, the hardware address will be all 1s in hexadecimal ( ie all F) . If the router has a loopback interface , select the highest IP from the loopback interface as the RouterID. bridge identifier ( bridge identifiers ) for the first 2 discovery layer switched internetwork and network selection root 1.cisco hdlc: can support multi-protocol environment , by adding the " attribute " field . 2.standard hdlc: only support single-protocol environment The station's HDLC communication mode, where the transmission can start from the primary station or a secondary station. The packet's ability to process packets faster. 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. R14(config)#isdn switch-type basic-net3 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 Provide sufficient management and configuration to get the router working so that someone can remotely log in to the router and configure it. Interface serial 0 There are multiple links on the same network, and STP will shut down - ports to block network loops. ASBR autonomous system boundary router (Autonomous System Boundy Router) one on automatic call reconnect ( automatic call reconnection ) of the automatic call can avoid failure of the relay line CD carrier detection (cairierdetect) indicates that an interface has been activated or a modem-generated connection Switch function: Network layer : A collection of self-management systems that do not rely on information received from other systems or groups. change. The central switch does not have on-site switching capabilities. Therefore, all customer connections are returned to the CO . See CO . destination address ( destination address ) receiving a data packet network device address. RIP: Is the hop count as the metric for selecting the best route. The wrong route will be selected incorrectly. Call setuptime ( call setup time ) affects the length of time required for switched calls between DTE devices Disable returns from privileged mode to user mode 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 . 1OOBaseT is based on the IEEE 802.3U standard, 1OOBaseT is a baseband fast Ethernet using UTP wiring bridge identifier ( bridge identifiers ) for the first 2 discovery layer switched internetwork and network selection root Frame Relay bridging ( FR bridge ) in 1490 RFC definition, uses this bridging method =========================================================== =============== =========================================================== =============== =========================================================== =============== Is a point-to-multipoint connection. See control directVCC . CONSOLE PORT ( management console interface ): distance limit , exclusive way . A technique that allows for more data. The designated router is in case of failure. Please refer to the third part of the CCNA Professional English Vocabulary Collection : Classic Recommendations ; CCNA Professional English Vocabulary Collection Other routers maintain a record of existing available routes AEP AppleTalk Response Protocol (AppleTalk Echo Count to infinity ( calculation to infinity ) routing problem in a routing algorithm, routers continue to increase OSPF open protocol , is link-state type routing protocol . 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. Ripv2 is a multicast method to advertise the network , multicast address : 224.0.0.9 router rip edge device ( edge device ) so that the data packets can be based on the data link and network layer information in the old interfaces ( such as Ethernet and Token Ring ) and ATM devices forwarded by the interface between. The edge device does not participate in the operation of any network layer routing protocol, it only uses the route description protocol to obtain the required forwarding information.