20 Jan Providing Confidentiality

COM548 Advanced Networking Protocols

EXAM 2

Question 1 Suppose Host A is sending Host B a large file over a TCP connection. The number of unacknowledged bytes that Host A sends cannot exceed the size of the receiver buffer.

Question 1 options:

True

False

Question 2 Suppose Host A is sending Host B a large file to Host B over a TCP connection. If the sequence number for a segment of this connection is m, then the sequence number for the subsequent segment will necessarily be m+1.

Question 2 options:

True

False

Question 3 Consider congestion control in TCP. When the timer expires at the sender, the value of ssthresh is set to one half of its previous value.

Question 3 options:

True

False

Question 4 Host A is sending Host B a large file over a TCP connection. Assume Host B has no data to send Host A. Host B will not send acknowledgements to Host A because Host B cannot piggyback the acknowledgements on data.

Question 4 options:

True

False

Question 5 Voice and video traffic is often sent over TCP.

Question 5 options:

True

False

Question 6 CMP is primarily used for:

Question 6 options:

addressing.

error and diagnostic functions.

none of the above.

forwarding.

Question 7 The function(s) of network layer in a virtual-circuit network is/are:

Question 7 options:

all of the above.

routing.

forwarding.

call setup.

Question 8 Routers in both datagram networks and virtual-circuit networks both use forwarding tables.

Question 8 options:

True

False

Question 9 The network layer concerns with __________.

Question 9 options:

none of the above.

frames

bits

packets

Question 10 It has been said that when IPv6 tunnels through IPv4 routers, IPv6 treats the IPv4 tunnels as link-layer protocols.

Question 10 options:

True

False

Question 11 A circuit-switched network cannot guarantee a certain amount of end-to-end bandwidth.

Question 11 options:

True

False

Question 12 Which of the following protocol is used for Electronic Mail?

Question 12 options

TELNET

HTTP

SMTP

NNTP

Question 13 Network architecture refers to the organization of the communication process into layers.

Question 13 options:

True

False

Question 14 Host and end-system have the same meaning.

Question 14 options:

True

False

Question 15 Which of the following is not a transmission rate of Ethernet LAN?

Question 15 options:

10 Mbps

100 Gbps

1 Gbps

100 Mbps

Question 16 Can store-and-forward be used in a circuit-switched network?

Question 16 options:

No

Yes

Question 17 Which of the following is true?

Question 17 options:

SMTP and HTTP do not use handshake

SMTP uses handshake, HTTP does not

SMTP and HTTP use handshake

SMTP does not use handshake, HTTP does

Question 18 A __________ specifies how networked data is formatted into discrete units, such as packets or frames.

Question 18 options:

router

topology

protocol

communications medium

Question 19 Which of the following is true about TCP?

Question 19 options:

A guarantee that a certain value for throughput will be maintained

Data transfer is intact

A guarantee that data will be delivered within a specified amount of time

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Question 20 How many parallel connections does FTP maintain simultaneously?

Question 20 options:

2

4

3

5