A new service provider asked you to design its IS-IS network. You determined that two distinct IS-IS areas will
be required and you must now create an ISO addressing plan for the participating intermediate systems
(routers).
In this scenario, which two statements are correct? (Choose two.)
A.
The NET addresses can be configured on any interface.
B.
The NET addresses must be configured on the loopback interface.
C.
The system ID within the NET address must match for all intermediate systems within the same area.
D.
The system ID within the NET address must unique for all intermediate systems within the same area.
Explanation:
IS-IS uses ISO network addresses. Each address identifies a point of connection to the network, such as arouter interface, and is called a network service access point (NSAP).
The system identifier must be unique within the network.
http://www.juniper.net/documentation/en_US/junos15.1/topics/concept/is-is-routing-overview.html
For a router to support IS-IS, you must configure an ISO network entity title (NET) address on one of the router’s interfaces, preferably the loopback interface (lo0).
https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/iso-address.html
IS-IS supports multiple NSAP addresses on the loopback lo0 interface.
Structurally, an NET is identical to an NSAP address but has an n-selector of 00.
https://www.juniper.net/documentation/en_US/junos/topics/concept/is-is-routing-overview.html
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B & D
IS-IS supports multiple NSAP addresses on the loopback lo0 interface.
The system identifier must be unique within the network. For an IP-only network, we recommend using the IP address of an interface on the router. Configuring a loopback NET address with the IP address is helpful when troubleshooting is required on the network.
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Ans : A & D
tested in lab
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A & D.
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The question was explicit to say “two distinct IS-IS areas will
be required” which means that multiple Network Services Access Points is needed, therefore IS-IS supports multiple NSAP addresses only on the loopback lo0 interface.
B & D are the most appropriate answers.
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Option B says “must be” and it is not a MUST to configure the ISO add in the Lo0 int
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