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The function of a __________ protocol is to control access to the transmission medium and to provide an orderly and efficient use of that capacity.

A. LLC B. SAN

C. MAC D. MAN

Which of the following LAN technologies has the highest capacity?

A. Ethernet B. Fast Ethernet
C. Fiber Channel D. Gigabit Ethernet

In general, performance on a LAN _________ with an increase in the number of devices or the length of the wire.

A. increases B. decreases

C. fluctuates D. does not change

This long-wavelength option supports duplex links of up to 550 m of 62.5-m or 50-m multimode fiber or up to 5 km of 10-m single mode fiber. Wavelengths are in the range of 1270-1355 nm.

A. 1000BASE-SX B. 1000BASE-T

C. 1000BASE-LX D. 1000BASE-CX

Which of the following is the most commonly used standard for computer communications?

A. SLA B. TCP/IP

C. ISO D. USD

__________ allows users in two or more locations to interact simultaneously via two-way video and audio transmission.

A. Web conferencing B. Unified messaging

C. Videoconferencing D. Audio conferencing

Cables and associated connecting hardware whose transmission characteristics are specified up to _________fall into Category 5 UTP cabling.

A. 50 MHz B. 100 MHz

C. 150 MHz D. 200 MHz

A design factor relating to the transmission medium and the signal to determine the data rate and distance is:

A. bandwidth B. transmission impairments

C. interference D. all of the above

A basic service set (BSS) is:

A. the smallest building block of a wireless LAN

B. the same as an access point

C. the same as a control module

D. always connected to a backbone distribution system

IEEE 802.11 defines a number of services that need to be provided by wireless LAN to provide functionality. Which of the following is not one of these services?

A. Association B. Reassociation
C. Authentication D. Coordination

A typical coverage area for a WLAN has a diameter of _________.

A. 25 - 50 m B. 100 - 300 m

C. 150 - 250 m D. 200 - 300 m

IEEE 802.11 defines _______ services that need to be provided by the WLAN to achieve functionality equivalent to that which is inherent to wired LANs.

A. ten B. nine

C. eight D. seven

A station of this type either is stationary or moves only within the direct communication range of the communicating stations of a single BSS.

A. ISS transition B. no transition

C. BSS transition D. ESS transition

The physical layer for IEEE 802.11 has been issued in _______ stages.

A. 3 B. 5

C. 7 D. 9

Any entity that has station functionality and provides access to the distribution system via the wireless medium for associated stations.

A. access point B. basic service set

C. extended service set D. coordination function

Information that is delivered as a unit between MAC users.

A. MPDU B. ESS

C. MSDU D. DS

Each signal change or element is called a:

A. bit B. byte

C. baud D. signal

If a carrier wave is modulated with 4 amplitudes and 4 phase changes, how many possible signal combinations are there?

A. 4 B. 8

C. 16 D. 32

In Non Return to Zero encoding schemes, the signal or voltage level does not return to 0v (zero volts); one of the problems with this type of encoding is that:

A. it is sometimes difficult to synchronize the timing of the transmitter and the receiver

B. it does not work well with serial communications

C. the signal ground of the transmitter is often different from that of the receiver

D. it works only for analog signals

Asynchronous transmission includes a start and stop bit with each character transmitted to ensure:

A. that the total number of bits is a factor of 10

B. to allow a continuous stream of data

C. to prevent single bit errors from occurring

D. to allow the receiver to maintain synchronization with the sender

The efficiency of an asynchronous transmission using 1 stop bit, 1 start bit, and 1 parity bit is:

A. 20% B. 30%

C. 50% D. 70%

Standards are important when devices must communicate together; the four characteristics governed by these standards are:

A. mechanical, electrical, functional, and procedural

B. electrical, physical, functional, and signaling

C. fundamental, mechanical, procedural, and protocol

D. protocol, fundamental, physical, and signaling

An error-detecting scheme that employs a unique prime number is called:

A. parity checking B. frame sequence checking

C. error checking and error correcting D. cyclic redundancy check

In _________ the phase of the carrier signal is shifted to encode data.

A. PSK B. FSK

C. ASK D. BFSK

________ is concerned with the content of the signal.

A. Digital transmission B. Analog transmission

C. Digital signaling D. Analog signaling

Data communications via circuit switching involves three phases

A. connect, transfer, hang-up

B. ring, talk, hang-up
C. dial, transfer, disconnect

D. establishment, data transfer, disconnect

Which of the following is NOT one of classes of function for control signaling?

A. establishment B. supervisory

C. call information D. network management

Which of the following is NOT one of the stated advantages of packet switching over circuit switching?

A. there is less network delay B. data rate conversion can be provided

C. priorities can be used D. connections are never rejected

Which of the following is NOT a reason for network jitter when using packet switching networks?

A. packets may vary in length

B. packets may take different paths through the network

C. packets may encounter network congestion

D. data rates will vary from one trunk line to the next

In a __________ network, data entering the network from a station are routed to the destination by being switched from node to node.

A. packet switching B. simple switching

C. switched communication D. all of the above

________ are the branches between exchanges.

A. Subscribers B. Subscriber line

C. Exchanges D. Trunks

The heart of the call placement process for VoIP is the ___________, defined in RFC 3261, which is an application-level control protocol for setting up, modifying, and terminating real-time sessions between participants over an IP data network.

A. SIP B. SDP

C. PDP D. POP

Which of the following is an advantage of circuit switching?

A. provides speed conversion B. compatible with voice

C. appears nonblocking D. logical multiplexing

Prior to cellular radio, mobile radio and telephone services required:

A. a high-power transmitter/receiver

B. multiple transmitters/receivers

C. only one or two dedicated channels

D. that many channels be used, which exceed the frequency capacity

When a mobile unit moves, it may connect with a different base station. This action is called ____________.

A. a handoff B. a transfer

C. a reconfiguration D. a dropped signal

Which of the following is NOT one of the ways that frequency spectrum can be divided among active users?

A. frequency division multiple access B. time division multiple access
C. code division multiple access D. cell division multiple access

Because of the limited frequencies available, a key design element of any cellular system is to ___________.

A. use small cells

B. employ multiple access

C. limit the number of users at one time

D. use as many frequencies as possible

Which of the following is NOT one of the components of the WAP specification?

A. A framework for wireless telephony applications
B. A full-featured communications protocol stack
C. A programming model based on the WWW
D. A markup language adhering to XML

The WAP Programming Model uses a ________ that acts as a proxy server for the wireless domain.

A. translator B. WAP server

C. gateway D. decoder

Peak download rate for a 4G network is __________.

A. 1 Gbps B. 100 Mbps

C. 500 Mbps D. 384 kbps

_________ was developed to address the limitations of cellular and other wireless networks for providing data services to mobile devices.

A. WAP B. Droid

C. GEOS D. WML

Wireless communications is likely to be viewed as an essential part of enterprise network infrastructure except when:

Mobile communication is needed

Communication must take place in a hostile or difficult terrain that makes wired communication difficult or impossible

Communication facilities must be installed at low initial cost

The same information must be broadcast to many locations

The first two important applications developed for the ARPANET were:

A. Telnet and FTP B. Telnet and email

C. FTP and email D. email and world-wide-web

The problem of using IP numbers for addressing hosts in the Internet are resolved using __________.

A. the concept of domains and the use of domain names

B. the use of Telnet applications

C. the use of email servers

D. splitting IP addresses into four octets

A ________ is a site that has a collection of telecommunications equipment and usually refers to ISP or telephone company sites.

A. POP B. NSP

C. CPE D. IXP

_________ are programs that extract information from name servers in response to client requests.

A. Name servers B. DNS

C. Resolvers D. IP datagram

The domain ________ is for network support centers, Internet service providers, and other network-related organizations.

A. org B. info

C. com D. net

The newer IPv6 specification uses addresses to identify hosts that consist of:

A. 128 bits B. 64 bits

C. 32 bits D. 16 bits

The _________ is used to send files from one system to another under user command.

A. UDP B. SMTP

C. FTP D. SSH

Which of the following does distributed processing typically not support?

A. applications B. device controllers

C. data D. mainframes

Which of the following is not a function provided by servers in client/server systems?

A. printing services B. data entry

C. database services D. gateways

No redundancy guarantees for servers, storage systems, network equipment, and communication connections to Internet or other networks; single path for power and cooling distribution; no redundant components; and availability: 99.671% are _________ characteristics of data centers.

A. Tier 1 B. Tier 2

C. Tier 3 D. Tier 4

With __________ virtualization software is used to allow a piece of computer hardware to simultaneously run multiple operating system images.

A. network B. server

C. operating system D. storage

________ is a method for addressing, creating, updating, or querying relational databases.

A. SQL B. API

C. UTI D. GUI

Advantages of a web/database system as compared to a more traditional database approach include:

A. improved functionality and ease of administration

B. ease of administration and transaction tracking

C. rapid development and flexible information presentation

D. easy deployment and improved functionality

Email functions concerned with the protocol operations needed to transmit and deliver messages are considered:

A. message transfer agent functions B. client functions

C. email client functions D. user agent functions

Which of the following is a true statement regarding SMTP processing of messages?

A. messages typically are sent through multiple SMTP systems while going from the sender to the recipient

B. the SMTP sender remains responsible for a message until it has been delivered to the recipient

C. SMTP does not guarantee that all messages are delivered

D. SMTP attempts to send messages until the recipients become available

Which of the following is NOT a standard MIME content type?

A. audio B. binary

C. messages D. image

The _________ is fundamentally a client/server application running over the Internet and TCP/IP intranets.

A. World Wide Web B. ADMD

C. MDA D. Hypertext Transfer Protocol

The ________ relays mail for one application-level hop.

A. MSA B. MS

C. MTA D. MDA

Part II. Essay questions -

Answer the questions succinctly and clearly, explain your answer, and show your work. Answers, even if right but without an explanation, will get no credit. On the other hand, partial credit will be given for the right steps shown to solve a problem, even the final result is not correct. The explanations need to be brief, but complete, logical, and to the point. Do not quote anybody else; use your own words and calculations.

On page 362 of the textbook, figure 12.9 shows LLC PDU in a generic MAC frame. What is the highest and lowest percentage of the length of the MAC frame could be LLC PDU data?

In the Ethernet MAC frame, the data segment has a minimum length of 46 byte Why do we have to have a minimum size of data in this frame?

Everyone probably has a wireless router at home and/or at work. Do you think a wireless router is a pure layer 3 device? Why?

If a carrier signal uses a combination of modulation methods, how many bits of data can one signal carry with BFSK, QPSK, and 8 possible different amplitude?

A packet with the size of 2K bytes goes through a WAN. If the packet goes through 10 store-and-forward switching/routing devices, all of which have the transmitting rate of 2Mbit/s, what is the total delay the packet experiences in this WAN? Please ignore the processing delay and propagation delay.

In a highly populated area such as big cities, a cell of a cellular network may have way more user than a cell in other areas. What methods are available for crowded areas?

In a CDMA network, two users with codes 110110 (user A) and 100101 (user B). What would be the bit sequence for each user in the encoded message "1010"?

In a network system the administrator wants to monitor the traffic going through each switch point, and control the routing accordingly to balance traffic going through each link. Please create one distributed solution, one centralized solution, and briefly describe under what conditions one of the two solutions are preferable.

 


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