Self-Assessment Quizzes Chapter 4 MC,T&F

*1.

The link-state algorithm in Section 4.5 has the following properties:

it determines the shortest path from the source node to all other nodes
after the kth iteration, the least-cost paths are known to k nodes
it requires the source node to know the costs between every pair of adjacent nodes in the graph
all of the above

*2.

In routing among ASs, which of the following issues dominants:

geographical distance between ASs
current congestion levels in the ASs
number of ASs traversed
policy

*3.

Suppose an application generates chunks of 60 bytes of data every second, and each chunk gets encapsulated in a TCP segment and then an IP datagram. What percentage of each datagram will contain application data.

60%
20%
40%
80%

*4.

Consider sending a 1300 byte datagram into a link that has an MTU of 500 bytes.

Three fragments are created, with offsets 0, 460 and 920.
Three fragments are created with offsets 0, 500 1000
Three fragments are created with offsets 0, 480 and 960.
None of the above

*5.

The ICMP protocol

none of the above
runs on top of TCP
runs on top of UDP
runs directly on top of IP

*6.

In a router, queuing can occur

in the input ports
in an interconnection network
in the output ports
all of the above

*7.

Suppose a router has n input ports each with identical line speeds, n output ports each with identical line speeds, and the line speed of an output port is at least n times as that of an input port. Further suppose that the switching fabric speed is at least n times as fast as an input line speed. Then

queuing can occur in the switching fabric
queuing can occur in an output port
there is no queuing delay in the router
queuing can occur in an input port

*8.

Suppose one IPv6 router wants to send a datagram to another IPv6 router, but are connected together by intervening IPv4 routers. If the two routers use tunneling, then

The sending IPv6 router creates an IPv4 datagram and puts it in the data field of an Ipv6 datagram.
The sending IPv6 router creates an IPv6 datagram and puts it in the data filed of an IPv4 datagram.
The sending IPv6 router one or more IPv6 fragments, none of which is larger than the maximum size of an IPv4 datagram.
None of the above

*9.

IPsec can provide:

Origin authentication
Encryption of IP datagram payloads.
All of the above.
Data integrity.

*10.

As part of hierarchical routing, hot-potato routing does the following:

Chooses the gateway that has the smallest cost.
Labels suspicious packets as “hot”.
Determines the number of ASes in the shortest AS path from router to destination.
Provides information to a router about the existence of external networks.

*11.

With a virtual-circuit network layer, packet switches are involved in virtual circuit setup, and each packet switch it aware of the VCs passing through it.

True
False

*12.

With a datagram network layer, each packet carries the address of the destination host.

True
False

*13.

In a distance-vector routing algorithm, each node has a map of the entire network and determines the shortest path from itself to all other nodes in the network.

True
False

*14.

In the BGP routing algorithm, each AS advertises to its neighbors its estimates of the shortest distances from the AS to all possible destination ASs.

True
False

*15.

OSPF uses BGP for routing among areas.

True
False

*16.

Every autonomous system must use the same intra-autonomous system routing algorithm.

True
False

*17.

Suppose the computer in your office has been configured with an IP address, and you move (along with your computer) to an office down the hall. If after the move your computer is connected to the same IP network, then it is not necessary to reconfigure the IP address in your computer.

True
False

*18.

The network portion of an IP address is the same for all the hosts on the same IP network.

True
False