Which statement is correct about the IS-IS ISO NET address?

Question

Options

• AAn ISO NET address defined with a system ID of 0000.0000.0000 must be selected as the DIS.
• BAn ISO NET address must be unique for each device in the network.
• CYou can only define a single ISO NET address per device.
• DThe Area ID must match on all devices within a L2 area.

• A
  6% (3)
• B
  80% (40)
• C
  10% (5)
• D
  4% (2)

Explanation

An ISO NET address is a type of network address used by the IS-IS routing protocol. It identifies a point of connection to the network, such as a router interface, and is also called a Network Service Access Point (NSAP). An ISO NET address consists of three parts: an area ID, a system ID, and a selector. The area ID identifies the IS-IS area to which the device belongs. The system ID uniquely identifies the device within the area. The selector identifies a specific service or function on the device, such as routing An ISO NET address must be unique for each device in the network, because it is used by IS-IS to establish adjacencies, exchange routing information, and compute shortest paths. If two devices have the same ISO NET address, they will not be able to communicate with each other or with other devices in the network. Therefore, it is important to assign different ISO NET addresses to each device in the network.

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