Computer Networking Final Exam ALL
QUIZ/MIDTERM QUESTIONS Questions
And Correct Answers.
T/F: Before sending a packet into the internet, the source must determine all of the links that
packet will traverse between source and destination. - answer✔False
T/F: Layers four and five of the Internet protocol stack are implemented in the end systems but
not in the routers in the network core. - answer✔True, Layers 4 and 5 are the Application and
Transport layers
T/F: The Internet provides its applications two types of services, a TDM (Time Division
Multiplexing) service and a FDM (Frequency Division Multiplexing) service. - answer✔FALSE.
Packet Switching is the now modern used service.
T/F: Suppose 10 connections traverse the same link of rate 1 Gbps. Suppose that the client access
links all have rate 5 Mbps. Then the maximum throughput for each connection is 100 Mbps. -
answer✔False! Maximum throughput is limited to the smallest pipe, i.e. 5 Mbps.
T/F: Consider a queue preceding a transmission link of rate R. Suppose a packet arrives to the
queue periodically every 1/a seconds. Also suppose all packets are of length L. Then the queuing
delay is small and bounded as long as aL < R. - answer✔True! R is bits or bytes per second, so if
a packet is L bits/bytes long, and it passing the transmission link at rate 1/a seconds...
T/F: In a virtual-circuit packet-switched network, a packet switch maintains state information for
each connection passing through the router. - answer✔True!
Parts that make up network delay. - answer✔Queuing Delay -
Transmission Delay-
Processing Delay-
Propagation Delay-
UDP service: - answer✔Unreliable, used in gaming applications
What is true for HTTP: - answer✔It can be both non-persistent and persistent, it uses tcp, and is
stateless.
HTTP 1.0 protocol supports following methods: - answer✔GET, HEAD, POST
T/F: Connections in a UDP application starts with a 3-way handshake - answer✔FALSE! UDP is
the sending of information with no handshake to a destination. This is why it is unreliable.
3-Way handshake has the following paket sequence: - answer✔1. SYN,
2. SYN-ACK,
3. ACK
Assuming a single non-persistent connection, how long does it take to to download a very small
object from a server?
What about 3 very small objects? - answer✔1 object: 2 RTT (Round trip time)
3 objects: 6 RTT
Which DNS record gives the IP of a host? - answer✔'A'
T/F: Consider an HTTP Web server using persistent connections. Suppose the server spawns a
separate process for each client that connects to the server. Then each of these spawned
processes will have different server port numbers. - answer✔False! The server uses the client
side ip and port to determine what to respond to and where to send a response.
T/F: Suppose that host A wants to send data over TCP to host B, and host B wants to send data to
host A over TCP. Two separate TCP connections - one for each direction - are needed. -
answer✔False! Once a three way handshake is established, data can be transmitted in both
directions.
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