Security and Physical Layer
Subject: Computer Networks
Sample Practice Questions
Question 1: Physical or logical arrangement of network is __________
- Topology
- Routing
- Networking
- Control
Explanation: Topology in networks is the structure or pattern in which each and every node in the network is connected. There are many topologies in networking like bus, tree, ring, star, mesh, and hybrid topology. There is no particular best topology and a suitable topology can be chosen based on the kind of application of the network .
Question 2: Which network topology requires a central controller or hub?
- Star
- Mesh
- Ring
- Bus
Explanation: In star topology, no computer is connected to another computer directly but all the computers are connected to a central hub. Every message sent from a source computer goes through the hub and the hub then forwards the message only to the intended destination computer.
Question 3: _______ topology requires a multipoint connection.
- Star
- Mesh
- Ring
- Bus
Explanation: In bus topology, there is a single cable to which all the network nodes are connected. So whenever a node tries to send a message or data to other nodes, this data passes through all other nodes in the network through the cable. It is really simple to install but it’s not secure enough to be used in most of the computer network applications.
Question 4: Data communication system spanning states, countries, or the whole world is ________
- LAN
- WAN
- MAN
- PAN
Explanation: WAN is the abbreviation for Wide Area Network. This network extends over a large geographical area. WANs are used to connect cities, states or even countries. A wireless connection is required to build a WAN. The best example of WAN is the Internet.
Question 5: Data communication system within a building or campus is________
- LAN
- WAN
- MAN
- PAN
Explanation: LAN is an abbreviation for Local Area Network. This network interconnects computers in a small area such as schools, offices, residence etc. It is the most versatile kind of data communication system where most of the computer network concepts can be visibly used.
Question 6: WAN stands for __________
- World area network
- Wide area network
- Web area network
- Web access network
Explanation: WAN is the abbreviation for Wide Area Network. This network extends over a large geographical area. These are used to connect cities, states or even countries. They can be connected through leased lines or satellites.
Question 7: In TDM, slots are further divided into __________
- Seconds
- Frames
- Packets
- Bits
Explanation: TDM is the abbreviation for Time division multiplexing. It is technique for combining several low rate channels to a single high rate channel. For a certain time slot, the several channels could use the maximum bandwidth. Each channel is inactive for a period of time too. Some other multiplexing techniques are Frequency division multiplexing and Phase division multiplexing.
Question 8: _____ is the multiplexing technique that shifts each signal to a different carrier frequency.
- FDM
- TDM
- Both FDM & TDM
- PDM
Explanation: FDM is an abbreviation for Frequency Division Multiplexing. This technique is used when the bandwidth of the channel is greater than the combined bandwidth of all the signals which are to be transmitted. The channel is active at all times unless a collision occurs with another channel trying to use the same frequency. Some other multiplexing techniques are Time division multiplexing and Phase division multiplexing.
Question 9: The sharing of a medium and its link by two or more devices is called _________
- Fully duplexing
- Multiplexing
- Micropleixng
- Duplexing
Explanation: Multiplexing is a method using which one can send multiples signals through a shared medium at the same time. This helps in using less resources and thus saving the cost of sending messages.
Question 10: Multiplexing is used in _______
- Packet switching
- Circuit switching
- Data switching
- Packet & Circuit switching
Explanation: Circuit switching is a switching method by which one can obtain a physical path between end points. Circuit switching method is also called a connection oriented network. Two nodes must be physically and logically connected to each other to create a circuit switching network.