Question 1

According to the IETF standards,if a router receives a series of packets from the same IP address to the same IP address,it should ________.

Accepted Answer

A) go through the entire process for each packet 
B) cache the decision made for the first packet and use this decision on subsequent packets 
C) skip the first step in the routing process but go through other steps for each subsequent packet 
D) none of the above

Question 2

In the mask 255.255.255.0,how many 1s are there?

Accepted Answer

A) 8 
B) 16 
C) 24 
D) We cannot say.

Question 3

Which is a problem with IPv4 addresses?

Accepted Answer

A) They cannot be used on wireless devices. 
B) They are too complex. 
C) Routers find it difficult to handle them. 
D) We have run out of them.

Question 4

If I simplify the address 2001:0000:0000:00fe:0000:0000:0000:cdef,I get ________.

Accepted Answer

A) 2001:::fe::::cdef 
B) 2001::fe::::cdef 
C) 2001:::fe::cdef 
D) 2001::00fe:::cdef

Question 5

Compared to normal routing,decision caching is ________.

Accepted Answer

A) faster 
B) less dangerous 
C) both A and B

Question 6

Routers usually are connected in a ________ topology.

Accepted Answer

A) point-to-point 
B) mesh 
C) hierarchical 
D) bus

Question 7

One-bit fields are called ________ fields.

Accepted Answer

A) SYN 
B) flag 
C) ACK 
D) none of the above

Question 8

The total length of an IPv4 address is ________ bits.

Accepted Answer

A) 8 
B) 16 
C) 32 
D) We cannot say.

Question 9

A TCP ________ segment is a request to close a connection.

Accepted Answer

A) FIN 
B) ACK 
C) Close 
D) Disconnect

Question 10

A router must use the Address Resolution Protocol process ________.

Accepted Answer

A) when a new router comes online 
B) when a router goes offline 
C) whenever it forwards an IP packet 
D) whenever it forwards an IP packet to a host that is not in its ARP cache

Question 11

Row 2707 has the mask /16 and the reliability metric 20.Row 4400 has the mask /16 and the reliability metric 10.Which row will the router choose if both are matches?

Accepted Answer

A) 2707 
B) 4400 
C) either A or B 
D) The router will choose the default row.

Question 12

Which IPv4 header field is used to specify quality of service?

Accepted Answer

A) type of service 
B) version number 
C) ECN 
D) differentiated services control point

Question 13

The router selects a row in which the next-hop router is labeled local.The router will send the packet to the ________.

Accepted Answer

A) default router 
B) local next-hop router 
C) local host 
D) destination host

Question 14

Router connectors are called ________.

Accepted Answer

A) sockets 
B) plugs 
C) interfaces 
D) ports

Question 15

Which of the following is one of the three parts of an IPv4 address?

Accepted Answer

A) subnet part 
B) mask 
C) both A and B 
D) neither A nor B

Question 16

In the IPv4 address 1.2.3.4,what is the network part?

Accepted Answer

A) 1 
B) 1.2 
C) 1.2.3 
D) It is hard to say with limited information.

Question 17

A mask has ________ bits.

Accepted Answer