Which of the following statement are correct regarding TTL value in VRRP packet?

• A.The TTL value of device from different manufactures is different; on VRP, the TTL value is 1.
• B.By default, the VRRP packet with TTL value not equal to 255 will be dropped; On VRP, we can use some commands to disable the function of delecting TTL value.
• C.The TTL value must be 255 In normal VRRP packet.
• D.The VRRP packet is only forwarded in one IP network, so the TTL value is always set to 1.

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Is the following statement correct or incorrect? Because a bypass tunnel Is manually created during TE FRR configuration, the constraint shortest path first (CSPF) does not need to be enabled.

• A.True
• B.False

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Which of the following statements regarding DIS election is correct?

• A.When a DIS fails, the backup DIS will take over.
• B.DIS election is configured manually.
• C.The IS-IS router with the highest priority in the whole broadcast network will be elected as the DIS.
• D.When the priority is the same, the router with higher IP address will be elected as the DIS.

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Compared with VPLS, what are the characteristics of EVPN?

• A.The PE learns the local and remote MAC addresses and their IP addresses through ARP and MAC address advertisement routes, and caches the information locally to prevent ARP request packets from being broadcast to other PEs and reduce network resource consumption.
• B.EVPN enables a device to implement load balancing among multiple EVPN routes with the same destination MAC address but different next hops when managing MAC addresses.
• C.By using the EVPN technology, PB on the carrier's backbone network do not need to establish full connections, which greatly reduces the network complexity and reduces the number of signaling messages.
• D.EVPN needs to be configured to be in full connection state on all PEs on the carrier's backbone network.
  That is, PWs must be set up between any two PEs.

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VXLAN uses MAC in UDP encapsulation to extend Layer 2 networks and encapsulates Ethernet packets on IP packets. When packets are transmitted on a routed network, the intermediate touting device does not need to learn inner MAC addresses.

• A.True
• B.False

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