Regarding the operation of integrated IS-IS on the IP network, the following statement is correct.

• A.IS-IS runs on the IP network and still uses the CLNS service provided by CLNP, which is at the same network level as the IP protocol
• B.Because of the use of CLNS, IS-IS still needs ES-IS protocol to forward host data
• C.In an IP network, IS is often referred to as a router
• D.IS-IS only collects the link status and calculates the route in the IP network, without ES-IS, the communication between the router and the host still relies on ARP, ICMP, DHCP and other protocols

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In the OSI network, Level-0 routing exists in _______.

• A.Between IS and IS between different regions
• B.Between ES and IS
• C.Between IS and IS between different routing domains
• D.Between IS and IS in the same area

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Running the command on the router and its display information is as follows:
<RTA>displaisis brief
ISIS (1) Protocol Brief Information:
network-entit:
01.1111.1111.1111.00
is-level: level-1-2
cost-ste: narrow
preference: 15
Lsp-length receive: 1497
Lsp-length originate: level-1 1476
level-2 1476
maximum imported routes number: 10000
Timers:
lsp-max-age: 1200
lsp-refresh: 900
Interval between SPFs: 10
From the above information, we can know that RTA______.

• A.is a Level-1-2 router
• B.The area number is 01.1111
• C.is a Level-2 router
• D.The area number is 01

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M In the network shown in the figure, the default next hop RTC of RTA, and the PBR configuration on RTA is as follows:
polic-based-route pbr_a permit node 10
if-match packet-length 64 100
applip-address next-hop 11.0.0.2
if-match packet-length 101 1000
applip-address next-hop 12.0.0.2
polic-based-route pbr_a dennode 20
Assuming that the strategy has been successfully applied, how will the data stream on RTA be forwarded?

• A.Messages with a message length of 101~1000 bytes will be sent to 11.0.02 according to the default route
• B.Messages with a message length of 64~100 bytes will be sent to 11.0.0.2.
• C.Messages with a message length of 101~1000 bytes will be sent to 12.0.02 according to policy routing
• D.Messages with a message length of 64 to 100 bytes will be sent to 11.0.0.2 according to the default route

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The following are core layer functions are _______. (select one or more)

• A.Access Security Control
• B.Has a large number of interfaces for connecting to end-user computers
• C.high-speed packet switching
• D.Necessary Routing Policy

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