ccna practice test questions

ccna practice test questions

I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary Define the IS-IS process For R2 , it is now in its own process 1 , while learning the route of this OE2 from R1 and R3 , how will it choose? Review 202 It can be seen from the CEF table that when PE1 receives the traffic from CE1 to CE2 at 2001:5555::5 , the label is compressed by two layers, and the outer layer is 301 , which is distributed by the P router, and the inner layer is 403 . PE1 is distributed. [Experiment 4 ] There is a main class network; there is a subnet route (match), the longest match meaning Routing feedback Subnet router anycast address: UNICAST_PREFIX : 0:0:0:0 There is a network environment in which two IPv4 networks are connected by a pure IPv6 provider, and then IPv4 routes have to be exchanged through BGP IPv6 peers. Because BGP4+ supports IPv4 and IPv6 protocol clusters, this is perfectly fine . Router(config)#ipv6 unicast-routing Router(config)#intertface f0/1 Track 1 rtr 1 reachability Ip nat inside source route-map nat4 interface serial0/0 overload R1 and R2 are in AS12 , and OSPFv3 is running in the AS , so that R1 and R2 can learn the loopback route of the other party. FastEthernet0/0 [up/up] Interface fast0/0 Ipv6 enable R2(config)#router ospf 1 200::/7 is reserved for the network service access point NSAP . Currently, the NSAP reserved space is not used . The NSAP address is mainly used in the ATM technology. LSP Holdtime Ip address 10.1.23.2 255.255.255.0 Binary prefix (high bits ) After receiving this poisoning message, B erases 10.4.0.0 from the routing table, but it still exists in the rip database , the status is possible down , the garbage collection time ( Garbage colletion CISCO default 60S ), the route is from B. The database is erased. With object tracking, PBR can be more flexible, and can make decisions based on ICMP , HTTP , the presence or absence of a route in the routing table, and the up/down of the interface . On R1 , only the summary route 32.0/21 is filtered, and all the detailed routes are released. If a standard ACL is used to match the route, how to write it? The functional components of ISATAP are as follows: IPv4- compatible address ! The router is typically used to determine whether the inbound interface and the source and destination address type CEF exchange . For consider CEF of routers , the outbound interface must be configured to CEF exchange mode , if the interface is configured CEF, then CEF will attempt to exchange data package. Otherwise , CEF will deliver the packet to the next best available exchange method. 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 ! The following is our CE1 , ping 2001:5555::5 , then capture the packet on the Fa1/0 port of PE1 : OSPF Ipv6 local pool dhcppool 2001::/64 64 interface Serial0/0 State Changed: 00:10:04 Format: Phase V Ipv6 enable 11 As the example above, it can be further abbreviated as: 2001 : a8 : 207 :: 8207 Define the longest IPv6 header ALG and IPV4 single protocol network host B maintain an IPV4 session. ALG is responsible for session conversion between IPV4 and IPV6 . This ALG has dual stack support capabilities. For example, suppose ALG is a dual stack and can act as a server for SMTP ALG . Then A can be based on IPV6 of Ip prefix-list ABC seq 5 permit 172.0.0.0/8 OSPF , but R3 ignores this route (locally configured with a static summary route pointing to null0 ), although the LSA is still passed to R5 , which means that although R5 still has a 1.0.0.0/8 route, the packet After being thrown to R3 , it is finally discarded at R3 , so there is still a problem here. Cc01.0cf0.0000 Router(config-router)# net XX.XXXX. XXX.XX Interface FastEthernet0/0 ipv6 enable In R2 on a simple look: The configuration of PE1 is as follows: [Test 2 ] 8 bits Authentication Type Metric problem By default, the longest matching principle is adopted. If it matches, it will be forwarded. If there is no match, the default route will be found. If the default route is not available, it will be discarded. The IPv6 globally unique address 2002:84d6:010a:1::1 , the destination IP address is the IPv6 globally unique address of the PC2 2002:ce7b:1fc8:2::2 . This IPv6 packet is sent to the default gateway of PC1 , which is the router A. . Image Ipv6 enable 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. Interface Serial0/0 ipv6 enable Routing via 192.168.12.1,ccna practice test questions, Serial0/0 Router(config-if)# ipv6 rip xxx metric-offset ? Image 2 : Reponse message, send all or part of its routing information, one R4.00-00 ! R3 sets the tag when injecting the route. Exit-address-family Hostname: R4 The forwarding entry is only (and the outgoing interface list is empty) and will not be processed further. These multicast data are then discarded at R2 . Set metric 2 !! Change the metric to 2 Image Image None Icmpv6 message defined for NDP B Route-map OSPF3to1 permit 10 match tag 10 Dual stack ( Dual Stack ) Set interface IP CEF turbo control turbo vector Image LSPID Tunnel adapter isatap.{0DB7233C-89B7-49DB-A8C0-D1AA005F4E6A}: Message type 1111 0xxx xxxx xxxx When 10.1.1.2 is reachable, the track object is true The IPv4 address obtained by the final PC is as follows: IPv4-Mapped NAT-PT Similarly, if ip route 3.3.3.0 255.255.255.0 null0 is the same. The vocation of the router is to maintain the routing table and use the routing table for data forwarding. The routing table contains routing entries or routing entries learned through various channels. The simplest and most straightforward method is to use static manual configuration to create routing entries for the router. This method is the most direct and controllable. The highest, the most simple configuration. In a small network, there seems to be no problem with static routing on the whole network. However, in a large network, if you use static routes purely, the workload is very large, not only the workload is large, but another more important defect is Static routes cannot be adjusted according to changes in network topology. Therefore, in large-scale networks, we often use static + dynamic routing protocols to complete route deployment.