cisco ccna exam

cisco ccna exam

No shutdown interface loopback 0 Ipv6 address 2000:12::2/64 ipv6 ospf network point-to-point ipv6 ospf 1 area 0 Image Ip route 172.16.1.32 255.255.255.224 192.168.23.3 Ip address 4.4.4.4 255.255.255.255 1 : Request message, requesting all or part of the routing information from the neighbor; Such as: 2001 : 00 a8 : 0 207 : 0000 : 0000 : 0000 : 0000 : 8207 Image Difficult analysis 500 R2 ignores R1 update sent over, because the "active examination", from R1 sent from the RIP updates and R2 of S0 / 0 Kou not in the same subnet, so R2 ignored R1 incoming routing updates. At this time, just validate-update-source under the RIP process of R2 . Image At this point , the route 1.1.1.0 is seen on R3 ,cisco ccna exam, which contains the next hop attribute, and the previous one. Ipv6 enable In the in direction, the distribution list can only filter the route when the LSA is received locally. When the route is generated, the router's own routing table that implements the distribution list will be affected by the distribution list (but the local LSDB still has the LSA ), and router will still LSADB in There are some other messages, which are described below. If multiple next hop IPs are defined , when the local outbound interface associated with the first next hop is DOWN , it automatically switches to the next next-hop . Router request ( RS ) Neighbor 2.2.2.2 send-label The TAG value is set when the originating ASBR generates an external LSA . If the external LSA is re-advertised to other OSPF autonomous systems, the TAG value is carried by default. Vlan 10 192.168.1.0 the OSPF routing but will be re-injected into the RIP (because we deploy a two-way re-release), this is the route Feedback , the route was filling back. PE1#show bgp vpnv6 unicast all 2001:5555::5/128 When the router is adjacent to the host, they learn in some way. PE1 and PE2 activated between MPBGP neighbor relations, to pass VPNv6 ready prefix <0-4294967295> I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary The buddy first introduced the above network environment. This Nima is a fairly classic case. OR1 and OR2 are the egress routers of the network, which are respectively connected to the egress lines of Netcom and telecommunications. PAT is implemented on both egress routers , so that intranet users can access the extranet. In addition to OR1 , Ipv6 unicast-routing interface Loopback0 Tunnel0 [up/up] MTU Interface fast1/0 ipv6 enable Followed by ACL to match traffic. Image When OSPF to IBGP when routes are heavy, because the OSPF of AD than IBGP of AD should be small, so there is no problem of sub-optimal routing path or loop: Passive-interface Fa0/0 neighbour xxxxxx The range of TAG values ​​in the external LSA Activate OSPFv3 on the interface Experimental needs ... partially omitted ... Table routing entry for the BGP [. 1:. 1] 2001: 5555 :: 5/128 , Version 32 Paths: (Available. 1, # Best. 1, Table Cisco) ::1 test.com Image address. In this way, B can actively access A , for example, B to ping 202.101.100.100 , can ping , the process is as follows: BGP table version is 1, main routing table version 1 2.0 and 3.0 . Now we can by R2 deployment of a distribution list on the distribute-List , so that R2 update to R1 filter out routing information in Ipv6 prefix-list loopb permit 2003::3/128 route-map test permit 10 Access-list 1 permit 202.101.100.0 0.0.0.255 Exit-address-family FF02::2 link local range all router multicast addresses The configuration of R3 is similar, except that the destination of the tunnel interface can be modified. X Interface tunnel1 Ipv6 enable Summary Image Origin codes: i - IGP, e - EGP, ? - incomplete Thinking question Ipv6 ospf 100 area 0 Redirect message 137 2001:1::1 The last command is to put the host of the IPv4 network 202.101.100.2 into the IPv6 network, so that the IPv6 only user has the access target. Otherwise, what destination address do you use the IPv6 only user to access the IPv4 only network? Image ! The last command is to put the host of the IPv4 network 202.101.100.2 into the IPv6 network, so that the IPv6 only user has the access target. Otherwise, what destination address do you use the IPv6 only user to access the IPv4 only network? Ip cef Redistribute connected subnets redistribute rip metric 10 subnets network 192.168.23.0 0.0.0.255 area 0 43200 0 Ipv6 address 2001::1/64 R4 released the RIP route of 100.1.1.0/24 , which can be learned by both ASBRs . The solution is to configure static summary routes on the two ASBRs : Ip address 202.101.23.3 255.255.255.0 At this point, take a closer look at R1 : IP CEF switching turbo vector Family Cisco VRF-IPv6 address !! for from CE1 learning IPv6 prefix route Ip route 172.16.1.0 255.255.255.224 192.168.12.1 Size R1(config)# access-list 1 deny 192.168.3.0 R1(config)# access-list 1 permit any R1(config)# router ospf 1 Access-list 2 permit 192.168.3.0 Ip route 172.16.1.0 255.255.255.0 192.168.12.1 The problem that the static route associated with the outgoing interface is re-released. IP Y When ISP1 is down, the interface of GW connected to ISP1 is DOWN , and the traffic of PC access 100 is automatically switched to ISP2. Image The next outgoing interface of the route is the port of the match . Exit-address-family ESP head Ipv6 unicast-routing interface Tunnel0 Route accurate summary algorithm Other orders When both the primary and secondary addresses exist, RIP will use both the primary and secondary addresses as the source to send routing updates. So R1 and R3 will learn the routing update of 2.2.2.0 . But R3 ca n't learn 1.1.1.0 , on the one hand, because R1 sends updates to R3 and is ignored by R3. Valid lifetime is similar to dhcp in the Lease Time . If the address exceeds the valid lifetime , the node will set this address to inactive and then delete . Between the preferred time and the valid lifetime is called the deprecated state. This state is a buffer . It is probably a deprecated state. When the address reaches this time period, the address cannot be actively initiated. The connection can only be passively accepted. Connection, this is also designed to ensure the upper layer application, but after the valid lifetime time address becomes invalid , then any connection will be down .