cisco ccna certification exam questions

cisco ccna certification exam questions

Interface eth 0/0 Note: LDP or TDP only generates labels for routing entries of the IGP protocol, and does not generate labels for BGP routing entries. 0 kbits/sec Attributes are explicitly assigned to the TE tunnel through administration action. 0/0/0 IGP metric: 1 Experimental procedure Net 49.0001.0000.0000.0003.00 Tunnel mpls traffic-eng bandwidth 2000 OSPF *Aug 18 09:06:07.919: version=0 length in words=10 Note that at this time, although the LDP adjacency between R1 and R2 has been broken, in principle, LDP does not adjacency, in the case of synchronizing, TOS 0 Metrics: 1000 !! default tunnel port advertised cost = 1000 tunnel interface can be configured directly IGP Metric , for example, if the running OSPF , directly in the tunnel configuration mouth ip ospf cost can Configure the tunnel to use a statically specified path or a dynamic path calculated through the TE topology database. Now activated R1 is fast-reroute features modified R1 of Tunnel port configured as follows: PDU length : the length of the entire PDU , including the header Configuration command Link connected to: a Stub Network 1.1.1.1:0 75000 R1#show mpls ldp neighbor Overload Interface Loopback0 For example, R1 . 01 - 00, where R1 is SystemID (this is the system ID based on the host name ), 01 is the PseudonodeID pseudo node ID , and if it is sent by the pseudo node, it is non- 00 , 00 is the fragment number. Device Internet segment 10.1.xy.0 / 24 , where xy is the device number, X small y large 199 , R2 is 200 299 , and so on. Untag will remove all tag headers and turn them into a pure IP message. Network 10.1.34.3 0.0.0.0 area 0 Label subobject: Flags 0x1, C-Type 1, Label 0 The IS-IS network layer protocol ID in the ISO protocol stack is 0x83. Bw[4]: Ip router isis - IS-IS and ES-IS do not place routing information in IP or CLNP packets, but directly in the data link layer Frame (so that packaging is more efficient). Ip address 10.1.34.3 255.255.255.0 Let's take a look, why is it exposed to network information? Suppose A below router E , E made to be a packet to D under F. , The data packet is A tag the transferred B , assumed that the BC loop appears between subsequent label TTL is decremented to 0 , since the TTL value The setting is very small, so very quickly, the TTL is decremented to 0. At this time, B (message discarder) will send an ICMP error message back to E. Then, if B has E route (or label), B will The ICMP error message will be sent directly back to E. If not, B will continue to tag the error message and gradually pass it to D , D.As the PE ,cisco ccna certification exam questions, about E route, then back to the label and then loaded on E . Then, no matter what the situation, the final E can receive the ICMP error message generated by B.