[R1] ospf
[R1-ospf-1] area 1
[R1-ospf-1-area-0.0.0.1] network 10.0.12.0 0.0.0.255
As shown in the configuration, the administrator has configured OSPF on R1, but R1 cannot learn the routes of other routers. The possible reason is (). (Multiple Choice)

• A.This router does not announce the network connecting neighbors when configuring OSPF.
• B.This router is not configured with authentication, but the neighbor router is configured with authentication.
• C.The OSPF process ID is not configured when this router is configured.
• D.The area ID configured by this router is different from the area ID of its neighbor router.

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In Huawei AR routers, what is the priority of the static routing protocol by default?

• A.120
• B.60
• C.0
• D.100

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If the application layer protocol is Telnet, what is the value of the Protocol field in the IPv4 header?

• A.67
• B.53
• C.17
• D.6

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In the RSTP standard, in order to improve the convergence speed, the port directly connected to the terminal by the switch can be defined as ().

• A.Edge port
• B.Fast port
• C.Backup port
• D.Root port

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LDP penultimate hop pop-up mechanism (PHP), which allows the label to be ejected on the penultimate hop LSR. This can reduce the packet processing complexity of which options?

• A.All MPLS network equipment
• B.Last hop and penultimate hop device
• C.Last hop device
• D.Penultimate hop device

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