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The LSP is acknowledged by sending a PSNP PDU.

The LSP is acknowledged by sending an LSP PDU.

The LSP is acknowledged by sending a Hello PDU.

LSP are not acknowledged on broadcast links. The DIS sends periodic CSNPs to maintain database synchronization

Router R1 generates a Type 4 LSA that is flooded to areas 0, 1, and 2.

Router R3 generates a Type 4 LSA that is flooded to areas 0, 1, and 2.

Router R3 generates a Type 4 LSA that is flooded to areas 0 and 2.

Router R3 generates a Type 4 LSA that is flooded to area 0, and router R6 generates a Type 4 LSA that is flooded to area 2.

To support classful routing protocols.

To allow IP routes to be defined using any number of bits for the network portion of the address.

To allow interdomain routing between an IGP and EGP such as OSPF and BGP.

To simplify the allocation of IP address space by defining a fixed size for the network portion of the address for each of the address classes.

Different authentication types are not possible because IS-IS only supports password authentication.

An adjacency will not be formed

The two routers negotiate the authentication type and then reach the up state.

Only an L2 adjacency will form, as long as both routers are L2 capable.

L1 and L2 routers elect separate DIS's.

DIS uses multicast address 0180x200:0015 to communicate with other routers on the broadcast network.

If a new router starts up in a LAN and has a higher interface priority, the new router preempts the original DIS and becomes the DIS.

In broadcast multi-access networks, such as Ethernet, a single router is elected as the DIS. There is no backup DIS

Router R2 does not have a route to the system address of router R1 and therefore cannot respond to the ping.

There is no default route configured on the PC.

Router R2 does not have a route configured to the PC.

Router R1 needs to be configured with a default route.

The system interface is configured with IPv6 address 2001DB8 1:100:1/128

All interfaces are configured for IPv4 and IPv6.

Interface "toR2" is configured with a globally routed IPv6 address.

Interface "toR3" is not configured for IPv6 with a global IPv6 address.

Add the "originate-default-route" option in the NSSA area configuration on router R3

Add the "summaries" option to the NSSA area configuration on router R1

Make a static route on router R1 to 192.168.3.1

Make a default route on router R2

Level 0

Level 1

Level 2

Level 0/1

Level 1/2

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