What three major tasks are performed by a Designated Intermediate System in an ISIS
pseudonode environment? (Choose three.)

A.
Updating the pseudonode LSP

B.
maintaining pseudonode link-state information

C.
creating the pseudonode

D.
flooding LSPs over the LAN

E.
election of the pseudonode

Explanation:

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00802043df.shtml#whatisd
is
What is the DIS?
On broadcast multi-access networks, a single router is elected as the DIS. There is no backup DIS
elected. The DIS is the router that creates the pseudonode and acts on behalf of the pseudonode.
Two major tasks are performed by the DIS:
• Creating and updating pseudonode LSP for reporting links to all systems on the broadcast
subnetwork. See the Pseudenode LSP section for more information.
• Flooding LSPs over the LAN.