cisco ccna test questions

cisco ccna test questions

The following are the addresses and ports that DHCPv6 might use: Image The Advertisement message notifies the prefix information. The RA message contains information such as prefix, lifetime, and default gateway. The general process is shown in the figure below. For more details, please refer to the relevant sections of this document. Address-family ipv6 The public network address of the ipv4 applied by the R1 router is 202.101.12.1 ; the public network address of the R3 application is 202.101.23.3. When we configure the ISATAP router on the host (pointing to the IPv4 address of the ISATAP router ), the ISATAP host starts sending RS messages to the ISATAP router , as shown below: Garbage colletion/flush timer 0/0/0 Define the longest IPv6 header These three representative routing re-release models. 32 bits Ip prefix-list ABC seq 5 permit 0.0.0.0/0 le 32 The configuration of R1 is as follows (basic configuration and OSPFv3 ): Neighbor 2023::2 prefix-list loopb out exit-address-family We see that the PC first generates an interface ID of 64 bits according to its locally configured IPv4 address: 1.1.1.1 : Can be abbreviated as: 2001 : a8 : 207 : 0 : 0 : 0 : 0 : 8207 The configuration of CE2 is as follows: Link LSA ( LSA Type 0x0008 ): Each link has a link LSA . This new type provides the router's link-local address and lists all IPv6 prefixes for the link. FastEthernet0/0 Advanced features Address 10.1.12.1(10) Image Policy-based Routing ( PBR ) Policy Routing OR2 configuration Information, so that ISP1 is hanging, so the data of the PC accessing the 100 network is switched to ISP2 , and the network is constantly As can be seen from the results of the packet capture,cisco ccna test questions, 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 . The configuration of R2 is as follows: IP routing table ( IP Routing the Table ) Ipv6 nat v4v6 source 202.101.100.2 2001:2::2 Image FE80::CE02:8FF:FED8:0: martian next hop R2# Ip sla monitor schedule 1 life forever start-time now Next on R4 , summarize the external routes that are re-released by itself: The MPLS Domain consists of three routers: PE1 , P , and PE2 . The IGP protocol running in the domain is OSPF , and the process ID is 100 . Each of the three routers announces its own loopback port into Core 's OSPF . The address of Loopback is xxxx/32 , and x is the router number, such as PE1 is 2.2.2.2 , P is 3.3.3.3 , and PE2 is 4.4.4.4 . 11 Routing, accept updates. View the interface (network card, including virtual network card) index and name, equivalent to ipv6 if x under WindowsXP Redistribute rip metric 10 subnets distribute-list 1 out rip Ip address 4.4.4.4 255.255.255.255 PE1 , P , and PE2 form an LDP neighbor relationship and deliver IGP labels. LSP Seq Num LSP Checksum LSP Holdtime Image Tunnel mode gre ip note: Tunnel destination 10.1.23.3 Redistribute connected subnets redistribute rip metric 10 subnets network 192.168.23.0 0.0.0.255 area 0 Of course, R3 should also be configured similarly. Increase flow label Image Address does not change) Interface tunnel 0 Ipv6 enable ICMPv6 messages used by the NDP mechanism : ! What are the components of CEF : Perform horizontal split processing Look at the above picture, the gray space 172.16.0.0/16 , this network number, we call the main class network number , the so-called main class network number, meaning the network number, according to the IP address category to which it belongs , corresponding to The network number obtained after the default subnet mask length. Such as 172.16.0.0 this is a Each sequence number statement in the Route-map is equivalent to each row in the access control list. Top-down processing in the order of the serial number, once the matching sequence is found, it will not continue to search. RFC1058 Address-family vpnv6 neighbor 2.2.2.2 activate Then, if an OSPF process (this sentence may not be rigorous, everyone understands what I mean), the route can not be summarized, such as the following figure. Linklocal address of the router : Interface FastEthernet0/1 [Two times of prefix] Ipv6 route 2002::/16 tunnel1 R1(config-if)# ipv6 address 2001:0001::/64 eui-64 R1(config-if)#ipv6 nd prefix 2001::/64 ? No shutdown interface loopback 0 The configuration of A and B is extremely simple, so I won’t say it here. Routing strategy needs (reliability, redundancy, offloading model, etc.) 00 Ip cef BVI Bridge-Group Virtual Interface The configuration of R1 is as follows: Network 192.168.254.0 0.0.0.255 area 1 [Experiment 2 ] Both IPv6 islands use ordinary IPv6 global addresses. Show vrf ipv6 view vrf ipv6 6 A tool used to control routing updates can only filter routing information and cannot filter LSAs . Match metric matches the route with the specified metric. match route-type matches the specified type of route match community matches the BGP community. 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. Router ospf 1 Router ospf 100 Command If the RA packet contains authentication information, then the authentication is correct 2001::1 Image <0-4294967295> 32-bit tag value access-list 1 deny 172.16.32.0 0.0.0.255 In fact, this is more a problem, because such an approach, in fact, the last 8 bit group no matter what, will be live match, he is even more imprecise. Image Ipv6 address 2001:34::3/64 Route-map test permit/deny 10 CE1 's IPv6 prefix, and forms a VPNv6 prefix, which is advertised to its own MP-BGP neighbor PE2 . PE2 will correspond to the VPNv6 prefix. By default , Cisco routers enable fast switching or optimal switching or cef switching instead of process Static route Stateless autoconfiguration Neighbor 4.4.4.4 send-label redistribute connected redistribute ospf 1 Exit-address-family None [Experiment 3 ] No main class network; there is a default route, take the default route *Mar 1 00:11:47.887: ICMP: redirect rcvd from 192.168.123.1- for 2.2.2.2 use gw 192.168.123.2 Set as-path set community 0000: Add a 32- bit IPv4 address after 5EFE . As shown in the following figure, if the IPv4 address (for tunneling) configured for the ISATAP router is 2.2.2.2 , the interface identifier of the ISATAP tunnel is: Ip route 10.1.2.0 255.255.255.0 10.1.254.1 The configuration of PE2 is as follows: The GRE tunnel packet capture is as follows: Connect to a specific DNS suffix . . . . . . . : Modify the AD value of EIGRP None Conducive to the fast processing of hardware, so that intermediate nodes can avoid processing and save a lot of resources Experimental phenomena: *Mar 1 00:11:47.887: ICMP: redirect rcvd from 192.168.123.1- for 2.2.2.2 use gw 192.168.123.2 Interface FastEthernet0/0 ipv6 enable Verify again, instead of detailed routing, use a summary route of ip route 10.0.0.0 255.0.0.0 , the next hop is R3 , the effect is the same as above, also take R3 . Therefore, as long as it is not the default route, as long as there is such a matching route in the routing table, the route is taken preferentially, and the route-map is taken without the route . Interface-level command to join a multicast group, that is, the interface becomes a member of the multicast group. Ipv6 route 2001::/64 2002:CA65:C01::FFFF ! Internal EIGRP 2.2.2.0 Routing Although the next hop is directed to R1 , it does not use the outbound interface to create routing entries. From the experimental phenomenon, it is not matched by the match . Needless to say, 3.3.3.0 , the associated interface is s0/1 . On R3 : Ipv6 router ospf 100 Interface FastEthernet0/1 !! Connect A to the interface Ip address 3.3.3.3 255.255.255.255 Ip route 172.16.3.0 255.255.255.0 172.16.12.3 Image 10.1.12.2 CE1 's IPv6 prefix, and forms a VPNv6 prefix, which is advertised to its own MP-BGP neighbor PE2 . PE2 will correspond to the VPNv6 prefix. Path control Image 192.168.123.2 as the next hop better, then R2 subsequent packets sent to R2 . IS-IS adjacency considerations Metric=BW+DLY , where DLY is the accumulation of DLY along the inbound interface of the route , and BW is the minimum interface bandwidth. Obviously through DLY Metric Network Ip address 202.101.100.1 255.255.255.0 ! Standard ACL Interface FastEthernet0/0 ipv6 enable Interface Loopback0 Image Neighbor FE80::CE01:8FF:FED8:10 remote-as 12 neighbor FE80::CE01:8FF:FED8:10 password cisco Image Where the State if REACH represents a neighbor up; as STALE means that these neighbors in the last 30s inside is not reachable First B goes to ping 202.101.100.100 , the data packet is as shown. Certification Contains MTU , prefix information, etc. Prefix-delegation pool dhcppool lifetime 1800 600 Image Ipv6 address 2001::FFFE/64 no ipv6 nd suppress-ra Now we are configuring ISATAP on the ISATAP host. Generally speaking, the IPv6 protocol stack is installed by default on the WIN7 system. By default , there will be an ISATAP virtual network card. After we configure the IPv4 address of the physical NIC of the PC , such as 1.1.1.1/24 , the ISATAP virtual NIC will automatically calculate the special interface identifier as described above based on this IPv4 address: 0200:5efe:1.1.1.1 , pay attention to this The format is equivalent to 0200:5efe:0101.0101 . On the windows system, we can see the simple way of writing the former.