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Free H12-261_V3.0 Exam Braindumps (page: 14)

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PDF with 479 Questions

During ISIS's broadcast network database synchronization process, which of the following statements is true? (single choice)

  1. As DIS, R2 periodically sends CSNP.
  2. R2 acts as DIS, and the Hello time is three times that of ordinary routers.
  3. R2 as DIS will not receive PSNP requests from other routes.
  4. R1 and R3 maintain database consistency by periodically sending PSNP requests.

Answer(s): A



Two routers, connected together through serial ports, However, the interconnection cannot be pinged. Now check the port status as follows



Can you identify the cause from the above information? (Single Choice)

  1. Insufficient link bandwidth
  2. IP addresses at both ends are not on the same network segment
  3. Inconsistent link layer protocols at both ends
  4. Subnet mask mismatch

Answer(s): C

Explanation:

Different link layer protocols, R1 is HDLC, R2 is PPP



What is the main reason why RSTP converges faster than STP?

  1. RSTP adds types of port states
  2. RSTP has less overhead
  3. RSTP does not converge based on timers
  4. RSTP has smaller timers

Answer(s): C

Explanation:

RSTPFind and generate an optimal tree topology of the local area network, find topology failures and then recover, automatically update the network topology, enable backup links, while maintaining the best tree structure.



The following is about cross-domain VPN-Option The characteristics of C, the description is correct?

  1. A maximum of two layers of labels are required during packet forwarding.
  2. The ASBRs do not store VPNv4 routes, nor do they advertise VPNv4 routes to each other.
  3. VPN routes are directly exchanged between ingress PEs and egress PEs, without the need for intermediate devices to store and advertise VPN routes.
  4. Cross-domain VPN-Option The C method is not suitable for use when spanning multiple ASs.

Answer(s): B,C

Explanation:

Cross-domain VPN
OPTION A cross-area is also called back-to-back cross-area, that is, the border routers ASBR of two ASs act as PE andCE.
OPTION B Cross-domain also called single-hop MP-EBGP cross-domain, the AS transmits VPN information and builds LSP tunnels through normal MPLS/BGP, and between ASs transmits VPN information and builds LSP tunnels through the single-hop MP-EBGP protocol. OPTION C inter-area is also called multi-hop MP-EBGP inter-area. As long as BGP can establish a TCP connection, it can become a BGP neighbor and transmit routing information. Therefore, OPTION C directly communicates between the source and sink PEs through multi-hop MP-EBGP. The VPN routing information is transferred between the two, and then the LSP public network tunnel is constructed between the source and sink PEs.






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