Total of 50 marks. Answer the following questions. For multiple-choice
questions, circle the letter of the best response. For completion
(fill-in-the-blank) questions, write the word(s) that best complete the
Treat this assignment as an open-book individual exam. You may consult any of
your class notes or other books or documents, paper or electronic. However, you
may NOT discuss questions or share answers with any other person until
after the assignment is due.
Getting a packet from the source to destination through several connected networks is known as
- Simple parity checking can NOT detect
- an odd number of errors.
- an even number of errors.
- more than one error.
- any errors.
- Which is true about synchronous and asynchronous connections?
- Asynchronous transmissions are generally used for large amounts of
- Asynchronous transmissions are often combined with a clock signal.
- Synchronous transmissions require synchronisation bits at the end.
- Synchronous transmissions have a larger overhead than asynchronous
- What will happen if a receiver confirms receipt of a message but the
confirmation is lost before it reaches the sender?
- Which type of serial connection will generally have the highest
- A parallel cable must be short because over a long distance the signals on
the wires can become out of sync. This is known as ______________.
- A modem converts from __________________ to __________________ signals
when sending data from a computer to an older telephone line. 
- Which type of multiplexing uses a round robin scheme?
- Time division multiplexing
- Frequency division multiplexing
- Statistical multiplexing
- Which of the following would NOT generally improve data
transmission on cables?
- Using shorter cables
- Using shielding or insulation
- Using a medium with low electrical resistance
- Decreasing the number of cable twists per metre
- Which category of UTP cable can be used for both Ethernet and Fast
- Which type of connector is most commonly used for LANs?
- How many pairs of wires are in most UTP cables used today? ______________
- What is the most important difference between the Internet and an
- the number of users who have access
- the geographical distances covered
- the network protocols used
- the network software used
- Which is NOT an advantage of client-server networks over
- centralised administration
- initial investment
- strong user-based security
- Which of these peripherals is NOT generally shared on the network?
- hard disk
- Which workstation operating system has built-in network server
- Windows for Workgroups 3.11
- Windows NT Workstation
- Windows 2000 Professional
- The way that two different devices are connected is the
- A signal transmitting at 2.5 MHz can encode 8 bits per cycle. What is the
bandwidth of the signal? _________________
- Which type of network topology requires the least amount of cable?
- Which type of server lists many types of resources available on the
- Which is NOT generally a result of installing a network?
- increased peripheral cost
- need for administrator
- organisational changes
- security holes to plug
- What type of device is used to lengthen a LAN size by strengthening the
- In order to make content available on the Internet you need to use a
- web browser
- web client
- web page
- web server
- Which of the following can NOT get you connected to the Internet?
- an Internet café
- an Internet or online service provider
- an isolated local area network
- a standalone computer with a modem
- A disadvantage of protocols is that they tend to limit
- Which type of network was NOT originally standardised by the IEEE
802 committee because of speed?
- token bus
- token ring
- Which OSI layer is primarily responsible for the following tasks?
- displaying a retrieved web page in a web browser _________________
- getting a message from the sender's LAN to the receiver's LAN
- retransmitting after detecting a collision on a LAN _________________
- passing a token to the next workstation ___________________
- the sender breaking a long message into pieces _________________
- the receiver reassembling the pieces in the right order
- specifying the number and voltage of pins for a cable connector
- software to read USENET newsgroups ________________
- translating between bits of information and electronic signals
- displaying the user's original message, exactly as it was sent
- Which will most reduce the quality of analog data to be sent on a network?
- long sampling period
- many bits per sample
- mpeg compression
- non-linear digitising
- Which type of modulation is likely to be most adversely affected by
resistance during transmission over long distances?
- Which type of noise is likely to be a problem on a LAN with thick co-axial
cable and properly functioning terminators?
- impulse noise
- white noise
- What percent overhead would be used to perform both vertical and
longitudinal redundancy checks on just two bytes of data? 
- Which type of error correction is most commonly used at the end of message
packets in popular OSI model compliant network protocols?
- vertical redundancy check
- longitudinal redundancy check
- cyclical redundancy check
- Which is NOT a reason why forward error correction is rarely used
in data communication and networking?
- Few forward error correction algorithms have been invented
- Sending the data to reconstruct the message would be a large overhead
- The amount of processing required to reconstruct the message would be
- The error correction data could itself be damaged
- It is faster and easier to just resend the data
- Which is NOT a general characteristic of connectionless protocols?
- Used for high data rates
- High error rates are common
- Performed at lower OSI levels
- Used in LANs
- How are the RTS and CTS pins of a V.24 modem interface commonly used?
- transmitting data
- flow control
- error checking
- Which indicator light on an external modem would tell you that your
dial-up connection has succeeded?
- The letter A is represented the same in ASCII and EBCDIC except for the
- least significant bit
- most significant bit
- parity bit
- start bit
- The purpose of a preamble is
- to delimit the start of the data
- to make the packet meet the minimum length requirement
- to provide synchronisation
- to provide error checking
- The purpose of bit stuffing in HDLC synchronisation is
- to detect errors in the data
- to distinguish the data from the start and end of the message
- to make the message have the required length
- to make start and stop flags composed of long strings of 1s or 0s