QUESTION: 21

The association between LDP and IGP means that IGP suppresses the advertisement of reachable routes to ensure that LDP and IGP cooperate to complete network convergence, so that IGP and LDP maintain the same path, minimize traffic loss, and improve the reliability of the entire network.

True
false

Answer(s): A

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QUESTION: 22

Which of the following descriptions is correct about the MPLS processing mode for TTL?

in Pipe mode.
When an IP packet passes through an MPLS network, at the ingress node, IP TTL minus 1 maps to MPLS TTL field.
in the MPLS labelTTL, which has the same meaning as the TL field in the IP header. TTL can prevent routing loops in MPLS networks.
In Unifor mode, when IP packets pass through the MPLS network, the TTL minus 1. MPLS The TTL field is a fixed value.
in MPLS In VPI, if you want to hide the structure of the MPLS backbone network, you can use the IngUni on ress form mode.

Answer(s): B

Explanation:

By default, when an IP packet arrives at the ingress PE, the TTL value in the IP header is copied to the newly inserted label TTL after decrementing by 1. If this command is used, the TTL value in the IP header will not be copied, but the TTL value in the label will be set to 255. In this way, the P and outgoing PE of the public network are hidden.

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QUESTION: 23

In an MPLS VPN network, different CE devices can use different routing protocols to exchange routing information with the same PE device, and the routing protocols used between different CE devices and the same PE device are independent of each other.

True
false

Answer(s): A

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QUESTION: 24

Which of the following options use tunneling to communicate between IPv6 addresses?

Dual Stack
6 to 4
ISATAP
NAT64

Answer(s): B,C

Explanation:

Dual Stack: The dual-protocol stack technology refers to enabling both the IPv4 protocol stack and the IPv6 protocol stack on one device.
6to4: 6to4 is an IPv6 conversion transmission mechanism, which directly encapsulates IPv6 data packets in IPv4 data packets and embeds them in IPv6.The IPv4 address information of the address can be transmitted directly on the IPv4 network without explicitly configuring the tunnel. At the same time, a specially configured relay route allows it to communicate with the native IPv6 network. ISATAP: ISATAP (Intra-Site Automatic Tunnel Addressing Protocol) is an IPv6 translation transport mechanism that allows IPv6 packets to be transmitted through dual-stack nodes on an IPv4 network. Unlike 6over4, ISATAP regards the IPv4 network as the data link layer of a non-broadcast multi-access network, so it does not require the underlying IPv4 network infrastructure to support multicast. NAT64: is a stateful network address and protocol conversion technology, generally only supports IPv6 network side user initiates connection to access IPv4sideInternet resources.

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QUESTION: 21

QUESTION: 22

Explanation:

QUESTION: 23

QUESTION: 24

Explanation: