The advantages of a modular network architecture include ______. (select one or more)

• A.Allows dynamic invocation of IT resources through open interfaces to achieve a standard, compatible, secure, intelligent and manageable IT application environment.
• B.Each module can be planned and deployed separately, and network functions can be added or removed by adding or deleting modules, which is conducive to building complex networks.
• C.It replaces the traditional hierarchical network model, which is convenient for network planning and deployment.
• D.Allows different application functions or application systems to share data, resources and capabilities, and participate in business processes.

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There are 4 routes in the routing table 172.16.0.0/24, 172.16.1.0/24, 172.16.2.0/24, 172.16.3.0/24.
For route aggregation, the correct route after aggregation is __________.

• A.172.16.0.0/23
• B.172.16.0.0/24
• C.172.16.0.0/25
• D.172.16.0.0/22

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The routers RTA and RTB belong to different autonomous systems. The BGP related configuration is as follows, then between RTA and RTB ______.
RTA]
bgp 65001
timer keepalive 15 hold 45
peerRTB as-number 65001
RTB]
bgp 65002
timer keepalive 10 hold 30
peerRTA as-number 65002

• A.Able to establish eBGP neighbor relationship, the holdtime of RTA is 30s, and the holdtime of RTB is 30s
• B.Cannot establish eBGP neighbor relationship
• C.The eBGP neighbor relationship can be established. The holdtime of RTA is 15s and the holdtime of RTB is 10s.
• D.The eBGP neighbor relationship can be established. The holdtime of RTA is 45s and the holdtime of RTB is 30s.

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In IS-IS, ______ is divided into two types: Level-1 and Level-2.

• A.IIH
• B.CSNP
• C.PSNP
• D.LSP
• E.CLV

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Which of the following statements about PBR is correct is _________

• A.PBR can perform routing based on the source address of arriving packets
• B.Through PBR, you can set the attributes of routes imported by routing protocols
• C.PBR cannot route based on the length of arriving packets
• D.PBR is a mechanism for routing based on user-defined policies

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