cisco sample questions

cisco sample questions

Interface Ethernet0/1 1B of the sub-TLV length System ID 6 -byte system ID , ES or IS identifier, similar to OSPF 's Router ID , each device has a system ID , and the IP network, each interface has an IP , which is the difference between one of . Note: The SystemID must be unique across the entire Area and trunk ( Level2 ). Next-address 10.1.45.5 Receives packets from other L2 routers in the area and forwards the packets to the L2 routers of other areas according to the destination address (or to the L2 router of the same area ). Receive packets from L2 routers in other areas and forward the packets according to the destination address. 0 kbits/sec Interface Tunnel0 Mpls ip 75000 Virtual circuit ID of X.25 or ATM One is the LAN on to Ll Router ( Level-1 to the IS the Hello PDUs the IS LAN ), a method in LAN on to L2 of Router (a to the IS LAN the Hello PDUs the IS Level-2 ) In the standard SPF algorithm, there can be multiple equivalent paths to the same destination. We call it ECMP ( Equal-cost Multipath ). Interface eth 0/1 i ia 5.5.5.0 [115/158] via 10.1.123.2,cisco sample questions, FastEthernet0/0 10.0.0.0/24 is subnetted, 4 subnets 6.6.6.6/32 There is DIS in the LAN , DIS generates and updates the pseudo node information, and spreads the LSP in the LAN . The DIS sends CSNP every 10s , which lists the LSPs stored in its link state database . These CSNPs are multicasted to all IS-IS routers on the LAN . In the dynamic setup, let the tunnel head end router calculate the path that the TE tunnel can traverse the network to the tail end in an optimal manner. We only need to configure the destination of the tunnel , and then the first-end router uses the CSPF algorithm to calculate the path itself. 0xA339 The configuration of R3 is as follows: Ip address 10.1.45.4 255.255.255.0 LDP IETF standard ( TCP/UDP port number 646 ) TDP CISCO private ( TCP/UDP port number 711 ) The label header has a total of 32 bits and contains the following fields: Bw[0]: HELLO holdtime is the maximum allowable interval for an IS-IS router to receive 2 consecutive hello packets. Hello holdtime=hello interval × hello multiplier . Therefore hello holdtime defaults to 30S . If a router has not received any hello after the hello holdtime expires , the neighbor is declared invalid. Mpls traffic-eng tunnels ip rsvp bandwidth Tunnel mpls traffic-eng autoroute metric absolute resolution if the configuration of R2 is changed to: It can be seen that ES-IS plays a role in the CLNS network environment as if the ICMP , ARP and DHCP protocols in the IP network work together. R1#sh ip rsvp interface As a result, the size of the LSPDB is greatly reduced. Note that the above picture is just an abstraction and simulation concept. The ABCD four routers actually have ISIS adjacencies (in IS-IS broadcast). In the network, adjacencies are formed between routers of the same level on the same network segment, including all non- DIS routers. This is different from OSPF . However , after DIS , everyone The resulting LSP volume is reduced. That is to say, although all routers on the IS-IS broadcast network form an adjacency relationship, the synchronization of the LSDB is still guaranteed by the DIS . The LSP stability and reliability has been guaranteed. The operation of the SPF algorithm is naturally faster.