If two devices are connected, and one of them supports BFD detection function, while the other device does not support it, which functional feature of EFPD can be used by the device supporting BED detection function to realize link connectivity detection?

• A.Quick handshake
• B.One-arm echo
• C.Two-way detection
• D.Interface state linkage

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On an IS-IS network, two directly connected routers establish a neighbor relationship through the three-way handshake mechanism by default, regardless of whether the network type is P2P or broadcast.

• A.TRUE
• B.FALSE

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Which of the following descriptions of static NAT is incorrect?

• A.Using static NAT, when the external network accesses the internal network, the public address (destination address) carried in the packet will also be converted by the AT device into the corresponding private address.
• B.The relationship between the static NAT private address and the public address is one-to-one
• C.When using static NAT, each private address has a corresponding and fixed public address.
• D.Static NAT can map the port number of the private address to different port numbers of the public address. For example, the ICP23 port of the private address can be converted to the TCP20320 port of the public address.

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On an IS-IS network, each router can generate LSPs. Which of the following events trigger the generation of a new LSP?

• A.Related IS-IS interfaces go up or down.
• B.Periodic updates occur.
• C.Inter-area IP routes change.
• D.The IS-IS interface cost is increased.

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Which of the following descriptions of the NSSA area is wrong?

• A.The ABR in the NSSA area will convert Type 7 LSA into Type 5 LSA, and inject the LSA into the backbone area, thereby flooding the entire OSPF domain
• B.The ABR in the NSSA area will automatically inject a default route into the area, which is described by type 7 LSA
• C.Type 3 LSAs are not allowed inside the NSSA area, nor are Type 4 and Type 5 LSAs allowed inside the area.
• D.The NSSA area can import external routes without learning external routes from other areas of the 0SPF network

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