Networks Quiz/Sample Questions

Multicasting communication is a) When a packet is sent from a single source to a single destination b) When a packet is sent from a single source to multiple destinations c) When a packet is sent from multiple sources to a single destination d) None of the above

b

Bluetooth is an example of a) local area network b) personal area network c) virtual private network d) none of the above

b

If the ACK value is 200, then byte _______ has been received successfully a) 200 b) 199 c) 201 d) None of the above

b

A source or destination port address in TCP segment is ______________ bits long a) 48 b) 32 c) 24 d) 16

d

What are the four components of delay in networking?

Nodal Processing Queueing Delay Transmission Delay Propagation Delay

1 GBps is equivalent to a) 8Gbps b) 80 Gbps c) 54 MBps d) None of the above

a

A set of rules that governs data communication is known as a) Protocols b) Standards c) RFCs d) None of the above

a

In the congestion detection algorithm, if detection is by a time-out, a new __________ phase starts a) slow start b) congestion avoidance c) congestion detection d) none of the above

a

In the layer hierarchy as the data packet moves from the upper to the lower layers, headers are a) Added b) Removed c) Rearranged d) Modified

a

In the transfer of file between server and client over four hops(links), if the transmission rates along the path is 40Mbps, 30Mbps, 20Mbps, 10Mbps, the throughput of the connection between server and client is a) 10Mbps b) 20Mbps c) 30Mbps d) 40Mbps

a

TCP assigns a sequence number to each segment that is being sent. The sequence number for each segment is number of the _________ byte carried in that segment. a) first b) second c) middle d) last

a

The domain name system is maintained by a) distributed database system b) a single server c) a single computer d) all of the above

a

By default, what type of query does nslookup do for a domain? a) MX b) A c) CNAME d) NX

b

FTP server listens for connection on port number a) 20 b) 21 c) 22 d) 25

b

TCP is a(n) ___________________ transport protocol a) protocol delivery b) reliable c) best-effort delivery d) effortless delivery

b

The transport layer protocol serving HTTP for web browsing is a) RTP b) TCP c) UDP d) All of the above

b

What does the phrase "non-authorative answer" in the nslookup output mean? a) The information in the nslookup output is probably false b) The information in the output was obtained from a server cache c) The nslookup program is not finding any information at all d) The nslookup program cannot find a server to query

b

What is not true about persistent HTTP connection? a) multiple objects can be sent over a single TCP connection between client, server b) downloading multiple objects must require multiple TCP connections c) Takes lesser time than non-persistent connection d) All of the above

b

Which of the following 5 components must be a part of reliable data transfer protocol? a) Checksum, timer, congestion control, acknowledgement and pipelining b) Checksum, timer, sequence number, acknowledgement and pipelining c) Checksum, sequence number, congestion control, flow control and acknowledgement d) Timer, sequence number, congestion control, flow control, and acknowledgement

b

For the following event at reciever, what would be TCP receiver's action? Event: arrival of out-of-order segment higher-than-expected sequence number. Gap detected a) Delayed ACK. Wait up to 500ms for next segment. If no segment, send ACK b) Send cumulative ACK, ACKing both in-order segments, indicating seq # of next expected byte c) Send duplicate ACK, indicating seq # of next expected byte d) Do not take any action

c

If a packet size is 1500 bits and the rate at which a router can pump out packets is 10Mbps, then the transmission delay is a) 10 ms b) 150 ms c) 150 us d) None of the above

c

In TCP, the size of the transmission window is the ______________ of rwnd and cwnd. a) Maximum b) Sum c) Minimum d) Subtraction difference

c

The time required to examine the packet's header and determine where to direct the packet is part of a) Transmission delay b) Queueing delay c) Nodal Processing delay d) All of the above

c

Which of the following is NOT a part of the network protocol stack? a) session layer b) application layer c) synchronization layer d) link layer

c

Which one of the following protocols delivers/stores mail to the receiver server? a) post office protocol b) internet mail access protocol c) simple mail transfer protocol d) file transfer protocol

c

Application Layer Protocol defines a) Types of messages exchanged b) messge format, syntax, and semantics c) rules for when and how processes send and respond to messages d) All of the above

d

DNS database contains a) name server records b) hostname-to-address records c) hostname aliases d) all of the above

d

Network Security is about a) preventing unauthorized reading of information b) preventing unauthorized writing of information c) to make sure data is available in a timely manner when needed d) All of the above

d

UDP and TCP are both ______________ layer protocols a) Application b) Session c) Presentation d) Transport

d

Which of the following is not a correct statement? a) Router forwards packets b) Router has multiple IP addresses c) Routers build the backbone of the internet d) Routers examine packets up to transport layer

d