4A0-101 Alcatel-Lucent Interior Routing Protocols and High Availability Question and Answers

Router LSA

Network LSA

Intra-Area Prefix LSA

Link LSA

The router has a system interface, one point-to-point interface and one virtual link.

The router has a system interface, one passive interface, one point-to-point interface and one virtual link.

The router has a system interface, one point-to-point interface and one broadcast interface.

The router has a system interface, one passive interface, one point-to-point interface and one broadcast interface.

A route from IS-IS.

A route from OSPF.

A floating static route.

A static route.

1

10

100

1000

They are Type 7 within the area and are not modified at the ABR.

They are Type 5 within the area and converted to Type 3 at the ABR.

They are Type 5 within the area and are not modified at the ABR.

They are Type 7 within the area and converted to Type 5 at the ABR.

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.

10.10.10.2

10.10.10.3

10.10.10.4

10.10.10.6

There is no ASBR configured in the network.

When link-state information reaches the maximum age on a router, the router will flood that information to its neighbors.

When a router detects that any of its link-state information has reached the maximum age, it will request a new update from the source router.

Aging helps ensure that links, which are no longer part of the topology, will eventually get removed from the LSDB.

The age value is updated as the information is flooded throughout the network and when it is in the LSDB.

The router installs two routes for the destination with two different next hops. A hashing algorithm is used to distribute traffic over the two paths.

The router installs two routes for the destination with two different next hops. Traffic is evenly distributed over the two paths.

The router installs four routes for the destination with four different next hops. A hashing algorithm is used to distribute traffic over the four paths.

The router installs four routes for the destination with four different next hops. Traffic is evenly distributed over the four paths.

The router installs one route for the destination. Traffic is evenly distributed over the two paths.

ff00::1:2

fe80::216:4dff:fe13:5cae

::ffff:0:0.240.0.0.1

2001:db8::30a:216:4dff:fe13:5cae

fd01:2234:5678::1

The router sends a copy of the LSP from its database to its neighbor

The router updates its database with the LSP and floods a copy to its other neighbors.

The router updates its database with the LSP, acknowledges the LSP with a PSNP and floods a copy to its other neighbors.

The router updates its database with the LSP and acknowledges it with a PSNP.

Option A

Option B

Option C

Option D

Area addresses TLV

Intermediate system neighbors

TLV Authentication information TLV

Intermediate system neighbors

TLV Area addresses

TLV LSP entries TLV

The IP internal reachability information

TLV Area Addresses

TLV Authentication Information TLV

The IP external reachability information

TLV Area addresses

TLV Intermediate system neighbors TLV

L1 routers

L2 routers

L1/L2 routers

L1 and L2 routers

1

2

3

4

6

7

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 routing information base (RIB).

The routing table manager (RTM).

The equal cost multipath configuration (ECMP).

The forwarding information base (FIB).

The link state database (LSDB).

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

Area Border Router

Autonomous System Boundary Router

Designated Router

All routers within an OSPF area.

The router with the lowest priority is the DR.

The router with the highest priority is the DR.

If priorities are the same, the DR is chosen based on the lowest RID.

If priorities are the same, the DR is chosen based on the highest RID.

RIPv1 and RIPv2

OSPF

IS-IS

BGP

Show route-table

Show router routing-table

Show router route-table

Show static

Broadcast

Non-Broadcast Multi-Access

Point-to-Point

Point-to-Multipoint

No protocol extensions required

Only supported by OSPF and IS-IS

Transparent to routing neighbors

Uses Graceful Restart to inter-operate with other vendors

Full; both routers are exchanging Helios to maintain the adjacency.

The adjacency is down.

The adjacency is in exstart state.

The adjacency is in the exchange state.

The metric must be set accordingly for RIP

The subnet mask must be removed from the OSPF route

You must divide the cost of the OSPF route by three

The router must be configured as an ASBR

When a Link State Update is received in response to a Link State Request

When a router receives a Hello packet from a neighbor that contains its router id in the neighbor list

When OSPF neighbors exchange Database Descriptor packets

When a Link State Acknowledgement is received in response to a Link State Update

224.0.0.5

224.0.0.6

224.0.0.9

224.0.0.10

RIPv2 does not have support for multicast

configure router static-route 139.120.121.0/24 next-hop 138.120.199.2

configure router static-route 139.120.121.0/24 next-hop 138.120.199.1

configure router static-route 138.120.199.2/24 next-hop 138.120.199.1

configure router static-route 139.120.121.0/24 next-hop 139.120.121.2

The term backbone router has the same definition as the term area border router.

An OSPF network needs at least one area border router to function.

Area border routers connect the backbone area to other areas in an OSPF network.

By definition, an area border router must perform route summarization between areas.

The packet is flooded out all router interfaces.

The packet is dropped and an ICMP unreachable message is sent back to the source.

The packet is silently discarded.

The packet is flooded out all interfaces and an ICMP unreachable message is sent.

L1/L2 adjacency with router R2.

L1 adjacency with router R3

L2 adjacency with router R2

L1 adjacency with router R3

L1/L2 adjacency with router R2

L1/L2 adjacency with router R3

L1/L2 adjacency with router R2.

L1 adjacency with router R4

L1 adjacency with router R3

Source IP address

TCP source port

Prefix list

Protocol type

The corporate head office router will have a default route and the branch site will have a more specific static route.

The corporate head office router and the branch office router will both have specific static routes.

The corporate head office router and the branch router will both have default routes.

The corporate head office router will have a more specific static route and the branch office router will have a default route.

49.0012.1234

49.0012

12.1234

1234

49.1234

The prefix list reject should be "192.168.3.0/16 exact".

Router R1 should be configured as an OSPF "asbr".

The policy "reject" should be set for import rather than export.

The policy was likely not "committed" after creation.

This is not possible because OSPF cannot use import policies.

Manual route summarization can only be done on autonomous system border routers.

Manual route summarization must be done on all the backbone routers to be effective. Manual route summarization is optional on the routers in non-backbone areas.

Manual route summarization is done on the ABRs. By default, automatic summarization is done; however, it may not be optimal for all networks.

Manual route summarization is done on the ABRs. By default, no route summarization is done and all routes are advertised to all areas.

None

1

2

3

4

OSPFv3 uses MD5 Authentication.

Router LSAs carry IPv6 prefix information.

NSSA is supported in OSPFv3.

OSPFv3 uses a 64-bit router ID.

Challenge handshake authentication protocol (CHAP)

Two factor authentication

MD5 authentication

Extensible authentication protocol (EAP)

The CE routers run only IPv6.

The PE routers must run IPv4 and IPv6.

The P routers must run IPv4 and IPv6.

IPv6 routes on the PE routers may have an IPv4 address as the next hop.

Router R4 will have a route to router R6's system address with router R2 as the next-hop.

Router R4 will have a default route with router R2 as the next-hop.

Router R4 will have a default route with router R3 as the next-hop.

Router R4 will not have a route that can be used to reach the system address of router R6.

A BDR is always required on point-to-point links.

The second highest RID is always the BDR.

The BDR only listens for link-state updates sent to 224.0.0.5.

The BDR always acknowledges link-state updates from the DR

The router sends a copy of the LSP from its database to its neighbor.

The router updates its database with the LSP and floods a copy to its other neighbors.

The router updates its database with the LSP, acknowledges the LSP with a PSNP and floods a copy to its other neighbors.

The router updates its database with the LSP and acknowledges it with a PSNP.