Transport pdus are typically called

Multiple-Choice Questions:

1. 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

2. When using cellular networks, __________.

A. a single base station can serve multiple cells

B. adjacent cells must use the same frequencies

C. adjacent cells are assigned different frequencies

D. non-adjacent cells are assigned different frequencies

3. The ideal design for cells in a cellular network is a hexagonal shape because _____.

A. this makes enforcement of shapes easier

B. this is the easiest to implement

C. this makes all frequencies available to all cells

D. this makes the distance to all adjacent cells the same

4. 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

5. 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

6. 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

7. The Wireless Application Protocol (WAP) is:

A. proprietary protocol developed in the USA for wireless security

B. dependent on the specific network technologies employed

C. an Internet standard that replaces HTML, HTTP, and XML

D. designed to overcome many of the limitations hindering acceptance of mobile data services

8. 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

9. 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

10. For a given system, multiple access is based on _______.

A. TDMA

B. FDMA

C. CDMA

D. all of the above

11. Important objectives of computer security include:

A. confidentiality

B. integrity

C. availability

D. all of the above

12. One type of attack on the security of a computer system or network that impacts the availability of a system (e.g. destruction of a resource in the system) is referred to as ___________.

A. incapacitation

B. interception

C. modification

D. all of the above

13. The type of attack on communications lines and networks known as traffic analysis belongs to the general category of ____________.

A. active attacks

B. passive attacks

C. administrative attacks

D. none of the above

14. Of the three classes of intruders into computer systems and networks, the clandestine user is typically:

A. an insider to the organization

B. an outsider to the organization

C. either an insider or an outsider to the organization

D. none of the above

15. Which of the following is not an example of intrusion:

A. guessing and cracking passwords

B. running a packet sniffer on a workstation to capture user names and passwords

C. using an unattended, logged-in workstation without permission

D. all of the above are examples of intrusion

16. A secret entry point into a program that allows intruders aware of the breached area to gain access and bypass the usual security access procedures is called a:

A. logic bomb

B. Trojan horse

C. virus

D. none of the above

17. The stage of a virus where it is activated to perform the function for which it was intended is referred to as the _________.

A. propagation phase

B. triggering phase

C. execution phase

D. none of the above

18. A virus can be attached to a program by _________.

A. prepending

B. postpending

C. embedding other than at the beginning or end

D. all of the above

19. Which of the following statements regarding macro viruses is true?

A. a macro virus is platform independent

B. macro viruses infect documents, not executable portions of code

C. macro viruses are easily spread

D. all of the above

20. Which of the following statements is generally true regarding the original class of email viruses?

A. it sends itself to selected names on the user’s email mailing list

B. arrive in email attachments

C. usually do no local damage on the infected machine

D. all of the above

21. IPSec transport mode provides protection primarily for:

A. the Internet layer

B. upper-layer protocols

C. network and link-layer protocols

D. all of the above

22. The higher-layer protocols defined as part of SSL include:

A. handshake protocol

B. change cipher spec protocol

C. alert protocol

D. all of the above

23. The WiFi standard known as Privacy with message integrity can be described as follows:

A. a way of ensuring the privacy of the individual using WiFi

B. a technique that ensures that the data transmitted using WiFi have not been altered

C. a way of providing mutual authentication between a user and an AS

D. none of the above

24. A key logical component of an IDS is:

A. sensors

B. analyzers

C. user interface

D. all of the above

25. A stateful inspection firewall ________.

A. applies a set of rules to each incoming and outgoing IP packet and then forwards or discards the packet

B. controls TCP traffic by creating a directory of outbound TCP connections

C. acts as a relay of application-level traffic

D. sets up two TCP connections, one between itself and a TCP user on an inner host and one between itself and a TCP user on an outside host

26. Which of the following is not a central element of a typical antivirus scheme?

A. detection

B. identification

C. removal

D. deterrence

27. 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

28. The most complex part of SSL is the ___________ Protocol.

A. Handshake

B. Change Cipher Spec

C. Alert

D. Record

29. Which security area is addressed in IEEE 802.11i ?

A. authentication

B. key management

C. data transfer privacy

D. all of the above

30. The 802.11i architecture consists of ________ main ingredients.

A. one

B. two

C. three

D. four

31. The ________ is one of a number of major Internet interconnection points that serve to tie all the ISPs together.

A. CPE

B. POP

C. IXP

D. NSP

32. The ________ is a company that provides backbone service to an ISP.

A. NSP

B. CO

C. IXP

D. CPE

33. 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

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

A. Name servers

B. DNS

C. Resolvers

D. IP datagram

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

A. org

B. info

C. com

D. net

36. Transport PDUs are typically called ________.

A. channels

B. segments

C. bridges

D. frames

37. The ________ layer covers the physical interface between a data transmission device and a transmission medium or network.

A. physical

B. transport

C. application

D. network

38. IP appends a header of control information to each segment to form a(n) __________.

A. IP datagram

B. end system

C. checksum

D. port

39. The ________ supports a basic electronic mail facility by providing a mechanism for transferring messages among separate hosts.

A. SNMP

B. SSH

C. HTTP

D. SMTP

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

A. UDP

B. SMTP

C. FTP

D. SSH

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

A. 3

B. 5

C. 7

D. 9

42. 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

43. The logical function that determines when a station operating within a BSS is permitted to transmit and may be able to receive PDUs.

A. access point

B. basic service set

C. extended service set

D. coordination function

44. A set of one or more interconnected BSSs and integrated LANs that appear as a single BSS to the LLC layer at any station associated with one of these BSSs.

A. MPDU

B. ESS

C. MSDU

D. DS

45. Information that is delivered as a unit between MAC users.

A. MPDU

B. ESS

C. MSDU

D. DS

46. 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

47. A public telecommunications network can be described using four generic components:

A. senders, receivers, lines, and nodes

B. subscribers, local loops, exchanges, and trunks

C. subscribers, trunks, nodes, and loops

D. local loops, subscriber lines, exchanges, and trunks

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

A. establishment

B. supervisory

C. call information

D. network management

49. 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

50. 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