ccna sample test questions

ccna sample test questions

Path calculation Ip explicit-path name R2R4 enable next-address 10.1.12.2 0/0/0 IS-IS Transient Blackhole Avoidance *Aug 18 09:06:02.699: parameter id=127, flags=0, parameter length=5 Mpls label rangempls label range 400 499 interface fa0/0 Type 7 length 12: Fa0/0 ! AutoRoute metric Tunnel destination 5.5.5.5 Record Route: NONE The configuration of R1 is as follows: Interface eth 0/0 0 kbits/sec IS-IS Level-1 Link State Database: If a particular interface does not wish to activate LDP , use no mpls ldp igp to turn off LDP . The routing table for R1 is as follows: R1# LSP Head, Tunnel0, Admin: up, Oper: up Src 1.1.1.1, Dest 5.5.5.5, Instance 30 Fast Reroute Protection: None The current maximum available bandwidth is listed under the interface according to their respective priorities. Checksum: 0x6FEB Length: 132 Aggregation: The label stack is removed and an IP lookup is performed on the IP packet. 105 Router ospf 1 Network 10.1.12.1 0.0.0.0 area 0 Clear domain authentication Ip unnumbered Loopback0 33M Current LSP: After the basic configuration is completed, since R2 and R3 are L1\L2 routers , for both of them, they will advertise themselves to the local level1 area as a way to go out , by setting ATT in the LSP generated by themselves . we R1 point of view isis database has been able to see out. R1#show isis database Set-overload-bit The label is incorrect. This situation only occurs when the IGP is OSPF . Because if the loopback is used as the router-id of the ldp and it is not 32 -bit, OSPF will automatically issue the 32 -bit loopback address. Causes the label to be assigned an error. Interface fast 0/0 0 kbits/sec Path option 10, type dynamic (Basis for Setup, path weight 20) Point-to-point link Or Tunnel Id Router isis 10.1.34.4 [MPLS: Labels 403/505 Exp 0] 0 ​​msec 4 msec 0 msec // Prerequisites for advertising a label mapping message to a neighbor locally Source routing, policy routing, static routing, etc. 2.2.2.2 is directly connected, Loopback0 5.5.5.5 [110/31] via 5.5.5.5,ccna sample test questions, 00:00:01, Tunnel0 10.1.12.0/24 is directly connected, Ethernet0/0 10.1.23.0/24 is directly connected, Ethernet0 /1 R1 , R2 , R3 , and R4 are in Transit AS 1234 . The IGP protocol running in the AS is OSPF. Fa0/0 0/0/0 We spotted FIG, C for 30.0 / 24 bundled label prefix 0 , i.e. explicit null label, the label is then sent to map B , B also generates its own tag map is then sent to A . Then, at this time, if B receives a label packet from A and the value of the top label is 20 , then B finds its own LFIB and finds that the label is to be converted to 0 . Therefore, B replaces the top-level label with 0 and then forwards it to C. At this time, for C , it receives a label packet with a label value of 0. C cannot forward the label value 0 in the LFIB . Message, because this tag value can be assigned to multiple FECs , C just pops up 0The tag is also an explicit null tag. After that, another search has to be performed. Although the search has to be performed twice, C can obtain the QoS information of the packet by looking at the EXP bit of the tag header .