ccna security dumps 2018

ccna security dumps 2018

R2(config)# access-list 1 deny 192.168.3.0 R2(config)# access-list 1 permit any R2(config)# router ospf 1 The tunnel server is a simplified model of the tunneling agent. The tunnel agent is integrated with the dual stack Router . System Id Image Jul 20 2012 23:59 // Old prefix The GRE tunnel packet capture is as follows: 0000 011x xxxx xxxx IS-IS Level-1 Link State Database: !! activated RIP The PC receives an RA message and will do a test: Multicast address of all groups to which the host belongs 32bits of 0000: 5EFE plus 32bits interface IPv4 address (here, 2.2.2.2 ), the following configuration of FIG. The IPv6 global unicast address is also configured by using the 64-bit interface identifier. Of course, you can also manually configure the IPv6 global unicast address. You do not need to use the interface identifier. Automatic tunneling: The tunneling mechanism of ISATAP is also automatic. The tunnel is created between the host and the ISATAP router. The host prefers to know the IPv4 address of the ISATAP router . After the completion, simply show it on R2 : Netsh interface ipv6 show ? Image Strictly speaking, path control is a very big topic. In the deployment of a large network, it is often necessary to consider the control of the data traffic access path in order to make more rational and scientific use and allocation of network resources. At the same time, it enhances the reliability, redundancy and robustness of the network. 5 : local site range; Vlan 20 interface fast0/1 IPV6 and subnetting Route-map PBR permit 20 match ip address 2 ! Redistribute connected subnets redistribute rip metric 10 subnets Notice the Flag field, The link layer address corresponding to the Layer 3 address is parsed by the neighbor request ( NS ) and the neighbor advertisement ( NA ) message. Tag 1111, type extern 2, forward metric 64 Fast tag rewrite with Fa1/0, 10.1.23.3, tags imposed: {301 403} Each routing table entry must include at least the following three items: !! wherein 2.2.2.2 is R2 of Router-ID , attention since 100.1.1.0 in R3 of OSPF Ip address 202.101.100.1 255.255.255.0 Image If an OSPF in- process route cannot be summarized: The PMTU discovery protocol is defined in RFC1981 . IPv6 PMUTD uses ICMPv6 Type 2 messages. The typical process is as follows: When a node starts the IPv6 protocol stack, each interface of the node automatically configures a link-local address. This mechanism allows two IPv6 nodes connected to the same link to communicate without any configuration. The default gateway recommends using a link-local address because this address is the most stable. After 10.1.31.0 is passed to R2 , since R2 takes the mask of the receiving interface and finds that 10.1.31.0 has a position of 1 in the host part , the subnet is stored in the routing table and treated as a host route. : 10.1.31.0/32 GRE tunnel basic experiment OSPF Field name Interface FastEthernet0/0 technical background Ip route 192.168.10.0 255.255.255.0 fast 0/0 CEF form Router ospf 100 R3# Image Now we configure it on the ISATAP router. The IPv4 address assigned to the router is 2.2.2.2/24 , and a 16 bits 25 Tiao The packet contains a maximum of 25 routing entries. RFC1058 Ipv6 address 2001:12::1/64 When the IPv6 address is shorthand, multiple leading zeros can be omitted into a 0 ; So if we use a solution that re-releases static summary routes: experiment analysis R3# Ipv6 address 2004:1:1::1/64 ipv6 address 2004:1:2::1/64 The difference between set ip next-hop and set ip default next-hop is relatively simple, it is not resolved here. Overview of tunneling mechanism FastEthernet1/0 Image Router ospf 100 FastEthernet0/0 Default router information Interface FastEthernet0/0 ipv6 enable Tunnel mode ipv6ip Router(config)#ipv6 unicast-routing Router(config)#intertface f0/1 IPv6 network, here we use loopback simulation: 2001:8888::8/64 for subsequent testing. Ip route 0.0.0.0 0.0.0.0 192.168.12.1 No ipv6 rip RIPprocess enable As can be seen from the results of the packet capture, there are two layers of label . After the label is packaged into the P router , the top-level LDP label is popped up due to the PHP mechanism . Then the label packet is transmitted to PE2 , and PE2 pops up MP-BGP . The label is restored to the original IPv6 data and then forwarded to CE2 . Image Local site address (Site-local address) (interface) ip load-sharing per-destination Experimental phenomena: An IPv6 packet consists of a basic header plus zero or more extension headers plus an upper layer protocol unit. The meaning of several fields: If an OSPF in- process route cannot be summarized: R1(config-if)# ipv6 address 2001:0001::/64 eui-64 Ip address 10.1.12.1 255.255.255.0 Ipv6 route ::/0 2002:ce7b:1fc8:1::1 !! When the address space used by the accessed remote IPv6 network is not 6to4 , the default route is taken, and the next hop will be found. Address-family ipv6 Ipv6 unicast-routing You can modify the default parameters of the nd prefix advertisement under the interface. Set ip next-hop verify-availability 10.1.1.2 10 track 1 Double-point bidirectional routing re-issuing problems Ipv6 ospf 100 area 0 When both the primary and secondary addresses are present,ccna security dumps 2018, the RIPV1 router will use the mask of the secondary address of the interface that receives the route update packet locally (this has been verified in the above experiment). Therefore, R1 will send an ICMPv6 Type=137 redirect message to R3 to inform R3 that it is going to destination 2222::3 , someone is better than me, and the key information contained in this ICMPv6 message is R2 is LINKLOCAL address . The message is as follows: Interface ID R2#sh isis neighbors detail R* 0.0.0.0/0 [120/1] via 192.168.12.1, 00:00:03, Serial0/0 None FF02::1:FFF0:10 10.1.13.3 Conduct a three-layer forwarding decision. The CEF table maintains core information extracted from the routing table, which is used to perform forwarding decisions on received messages, including IP prefixes, recursive next hop addresses, and outbound interfaces. An important feature of the CEF table is its ability to make immediate decisions about recursive prefixes. Reference book The IPv4 address is extracted from the IP. If the destination is not a 6to4 address, then a 6to4 relay is required . Table routing entry for the BGP [. 1:. 1] 2001: 5555 :: 5/128 , Version 32 Paths: (Available. 1, # Best. 1, Table Cisco) Source starts to send IPv6 packets using MTU=1400 , and the packet arrives at B. 10.1.13.3 Enter the IPv6 address cluster Advanced features This method is very simple to deploy. In many cases, customers can use IPv6 hosts in the network to access V6 resources in order to save costs . At the same time, they are not willing to make large-scale changes and equipment upgrades to existing networks. This approach, buy a router that supports ISATAP , and even hang the ISATAP router on the network as long as it can access V6 resources and respond to ISATAP PC tunnel establishment requests.