In the IS-IS network as shown in the figure, the verification part of each router is configured as follows:
RTA-Serial2/0]isis authentication-mode md5 h3c
RTB-isis-1]area-authentication-mode md5 h3c
RTC-isis-1]domain-authentication-mode md5 h3c
Then on RTB, the status of the RTA neighbor relationship is ______; and RTC______RTB Level-1 LSP packets

• A.down; accept
• B.down; refuse
• C.up; refuse
• D.up; accept

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The characteristics of the distance vector routing protocol include ________. (Choose one or more)

• A.Send routing updates periodically
• B.Take the cost to the destination as the route metric
• C.Fast routing convergence
• D.Deliver routing updates hop by hop

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IS-IS can support network layer protocols such as _______.

• A.TCP
• B.IPv4
• C.IPv6
• D.CLNP
• E.Ethernet

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Level-1 routing exists in ________.

• A.Between ES and IS
• B.Between different areas
• C.Between different domains
• D.Between IS in the same Area

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In the NSAP address 06.2400.0001.0020.0300.01, which part is the Stem ID?

• A.2400.0001.0020
• B.01
• C.2400.0001.0020.0300
• D.06.2400
• E.0001.0020.0300

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