The fact that signal strength falls off with distance is called ________________.

Exam IT 505

Multiple Choice (20 questions , 2 points each)

Please Submit a word document of your exam. Please DO NOT repeat the questions. Only submit your answers for example 1.A, 2. B……Ect

1. Which of the following is NOT one of the typical characteristics of back-end networks?

A. high data rate B. high-speed interface C. distributed access D. extended distance

2. Problems with using a single Local Area Network (LAN) to interconnect devices

on a premise include:

A. insufficient reliability, limited capacity, and inappropriate network

interconnection devices B. insufficient reliability, limited capacity, and limited distances C. insufficient reliability, limited distances, and inappropriate network

interconnection devices D. limited distances, limited capacity, and inappropriate network

interconnection devices

3. Which of following is NOT one of the designs that determines data rate and

distance?

A. the number of senders B. the number of receivers C. transmission impairment D. bandwidth

4. The fact that signal strength falls off with distance is called ________________.

A. bandwidth B. attenuation C. resistance D. propagation

5. Which of the following is NOT one of the distinguishing characteristics for optical

fiber cables compared with twisted pair or coaxial cables?

A. greater capacity B. lower attenuation C. electromagnetic isolation D. heavier weight

6.________ is a set of function and call programs that allow clients and servers to intercommunicate.

A. IaaS B. SQL C. API D. Middleware

7. A computer that houses information for manipulation by networked clients is a __________.

A. server B. minicomputer C. PaaS D. broker

8. ________ is software that improves connectivity between a client application and a server.

A. SQL B. API C. Middleware D. SAP

9. The inability of frame relay to do hop by hop error control is offset by:

A. its gigabit speeds B. its high overhead C. the extensive use of in-band signaling D. the increasing reliability of networks

10. All Frame Relay nodes contain which of the following protocols?

A. LAPB B. LAPD

C. LAPF Core D. LAPF Control

11. The technique employed by Frame Relay is called __________.

A. inband signaling B. outband signaling C. common channel signaling D. open shortest path first routing

12. In ATM, the basic transmission unit is the ________.

A. frame B. cell C. packet D. segment

13. When using ATM, which of the following is NOT one of the advantages for the

use of virtual paths?

A. less work is needed to set a virtual path B. the network architecture is simplified C. the network performance and reliability is enhanced

D. channel connection setup times are reduced

14. Which of the following are WAN protocols?

A. Frame Relay B. T-1 C. SONET D. all of the above

15. Public switched services include which of the following?

A. ISDN B. WAE

C. dial-up/modem D. all of the above

16. Important objectives of computer security include:

A. confidentiality B. integrity

C. availability D. all of the above

17. 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. interruption B. interception

C. modification D. all of the above

18. 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

19. 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

20. The primary mechanism used in implementing denial-of-service attacks is the:

A. worm B. Trojan horse

C. bot D. all of the above

Essay Questions

1) Describe what are Backbone Networks and their characteristics. (10 points)

2) Describe what is Middleware and the role of Middleware in Client Server architecture(10 points)

3) Describe want is MPLS (Multi Protocol Label Switching) and what they are designed for?(10 points)

4) Describe the following security mechanisms: (30 points)

a. Authentication

b. Authorization

c. Accounting (Auditing)

d. Data encryption

e. Packet filters

f. Firewalls

g. Intrusion Detection Systems (IDS)

h. Intrusion Prevention Systems (IPS)