oDesk Networking Concepts Test Answers

Which layer of the OSI model corresponds to IP?

a. Network

Which protocol is connection oriented?

a. TCP

 According to the OSI model, which layer is responsible for routing?

d. Network

What is a token?

c. A special packet which travels from computer to computer in a token ring network.

According to the OSI model, which layer addresses the issues of communication media and cable connectors etc?

d. Physical

According to the OSI model, which layer breaks down the data into frames?

b. Data Link

Which cable uses RJ45 connectors?

c. Unshielded Twisted Pair Cable

d. Shielded Twisted Cable

Which cabling media does not suffer from Electro-Magnetic Interference (EMI)?

d. Fibre Optic Cable

 Which layer is broken down into the MAC and LLC sub-layers?

b. Data Link

What is multiplexing?

a. Allowing multiple sender and receivers to share a single channel

 According to the OSI model, which layer performs compression and decompression?

b. Presentation

Which of the following services is feasible using standard ISDN?

d. All of the above

What is the purpose of the shielding in a Shielded Twisted Pair (STP) cable?

c. To reduce Elector-Magnetic Interference

According to the OSI model, which layer addresses the issue of switching (packet switching, message switching etc)?

d. Network

What is attenuation?

c. Weakening of the signal in a cable over a distance

What do you call a medium which only allows a single channel
d. Baseband

Which of the following is a Class A network?
b. 126.0.0.0

According to the OSI model, at which layer are network addresses assigned?
d. Network

At which layer does a Hub operate?
b. Physical

What is the speed of a E1 line?
c. 2.048 Mbps

According to the OSI model, which layer addresses the issue of connections (connection-oriented/ connection-less communication?
d. Transport

According to the OSI model, which layer performs the function of transforming bits of data into electrical signals and sending those signals across the media?

d. Physical

What does CSMA/CD stand for?
c. Carrier Sense Multiple Access/ Collision Detection

How is a unique MAC address assigned to a Network Card?
a. It is built into the card when the card is manufactured

At which layer of the OSI model,does FTP operate?
a. Application

Which of the following is not a fiber optic based network?
c. Frame Relay

What is the full form of PPPoE?
c. Point to Point Protocol over Ethernet

What is ATM (Asynchronous Transfer Mode)?
c. It is a WAN technology based on time division multiplexing that used fixed size packets known as cells

What is the binary value of hex BF?
b. 10111111

Which of the following is a Fiber Optic Connector?
c. MT=RJ

What is the speed of ISDN PRI service with 30B +1D channel?
a. 2.048 Mpbs

What is the maximum number of valid IP addresses in a class B network?
b. 65534

For which layer of the OSI model has the Ethernet standard been defined?
a. Physical

Which media access technique does Ethernet use?
b. CSMA/CD

How many twisted pairs does a UTP Cat 5 have?
b. 4

Which protocol user port number 23?
c. Telnet

Which of the following is an 'end-to-end' layer?
d. Transport

What is the purpose of twisting the pairs of cables together in a UTP cable?
c. To reduce Electro-Magnetic Interference

What is the recommended maximum length(approx) for a segment of UTP cable?
c. 100m

What is the X.25 protocol?
a. It is a packet switching WAN protocol based on public data networks