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A large number of external routes are imported to an NSSA of an enterprise's OSPF network. The customer requires that the number of LSAs in non-special areas be reduced. To meet this requirement, route summarization can be configured on an ABR in the NSSA to summarize the routes corresponding to the Type 5 LSAs translated from Type 7 LSAs.

A.

TRUE

B.

FALSE

An enterprise administrator wants to configure single-hop BFD to implement fast detection of direct links. Which of the following configurations are mandatory?

A.

Configure the remote discriminator of a BFD session.

B.

Configure the local discriminator of a BFD session.

C.

Configure a multicast IP address for BFD.

D.

Enable BFD globally.

Which of the following statements are true about basic BGP concepts?

A.

The router ID of BGP is a 32-bit value used to identify a BGP device. Each BGP device must have a unique router ID. Otherwise, BGP connections cannot be established between peers.

B.

BGP running within an AS is called IBGP. To quickly transmit routes, a BGP device advertises the routes learned from an IBGP peer to other IBGP peers.

C.

BGP running between ASs is called EBGP. To prevent routing loops between ASs, a BGP device discards the routes received from EBGP peers if they carry the local AS number.

D.

The device that sends BGP messages is called a BGP speaker. It receives or generates new messages and advertises them to other BGP speakers.

When performing a lookup in its FIB table for a packet, a router performs a bitwise "OR" operation on the destination IP address of the packet and the mask of each entry in the FIB table. If the resulting address matches the corresponding network address in the FIB table, a matching route is found.

A.

TRUE

B.

FALSE

Which of the following attacks is not the network layer attack?

A.

IP spoofing attack

B.

ICMP attack

C.

Smurf attack

D.

ARP spoofing attack

A wide area network (WAN) is a remote network that connects local area networks (LANs) or metropolitan area networks (MANs) in different areas for communication purposes. It is typically used to interconnect campus networks or data center networks.

A.

TRUE

B.

FALSE

Which of the following statements regarding multicast MAC addresses are false?

A.

One multicast MAC address maps to 32 multicast IP addresses.

B.

One multicast MAC address maps to only one multicast IP address.

C.

The high 24 bits of the multicast MAC address are 0x01005E, the 25th bit is fixed to 1, and the lower 23 bits of the MAC address map to the lower 23 bits of the multicast IP address.

D.

A multicast MAC address identifies receivers of a multicast group on the data link layer.

On the campus OSPF network shown in the following figure, the interfaces connecting the five routers are GE interfaces, and their costs are not changed. The import-route command is run on R1. After the network converges, the route to the server at 192.168.1.0/24 is queried on R2. Which of the following is the cost of this route?

A.

2

B.

4

C.

3

D.

1

In inter-AC roaming scenarios, an AC can function as the mobility server of multiple mobility groups, but can be added only to one mobility group.

A.

TRUE

B.

FALSE

When two BGP peers support different Hold Time, they will negotiate to support the shortest Hold Time interval they can support.

A.

TRUE

B.

FALSE