Deck 12: Wide Area Network Essentials

Question 1

Which of the following protocols is NOT used for Windows 7 VPN connections?

A) SMTP
B) PPTP
C) L2TP
D) SSTP

Answer 1

A

Question 2

Select the true statement regarding analog and digital signals.

A) Analog signals vary over time continually and can be represented by a sine wave, while digital signals are binary 1s and 0s using voltage levels.
B) Digital signals vary over time continually and can be represented by a sine wave, while analog signals are binary 1s and 0s using voltage levels
C) A modem is not required to use a line that uses analog signals.
D) On fiber optic media, a 1 bit can be represented as a pulsing analog signal.

Answer 2

A

Question 3

Which one of the following is NOT a typical SONET data rate?

A) OC-3
B) OC-48
C) OC-768
D) OC-9001

Answer 3

D

Question 4

You're the network administrator for a large bean-bag chair company. You are presenting to your supervisor several reasons to make use of cloud computing for handling data processing. Which answer would be a valid benefit of using cloud computing?

A) always on, always available access independent of network status
B) reduced physical plant costs
C) increased use of localized resources
D) decrease in user application training time

Question 5

Which statement about Multiprotocol Label Switching (MPLS) is true?

A) MPLS is popular because of its ease of use and inexpensive cost.
B) MPLS works with any network layer protocol.
C) MPLS is dependent on Data Link layer technology.
D) MPLS will run over ATM, frame relay, SONET, but not Ethernet.

Question 6

You are a network architect for an IT consulting company. One of your clients needs a WAN connection and has asked you about the disadvantage of a packet-switched WAN method. Which of the following is a disadvantage that applies?

A) low bandwidth
B) expensive compared to leased lines
C) suspect reliability
D) shared bandwidth

Question 7

Your local ISP has provided you with a dedicated line that has a Committed Information Rate of 1.54 Mbps. What does this mean?

A) 1.54 Mbps is the guaranteed maximum transmission rate.
B) 1.54 Mbps is allocated and available for burst network traffic only.
C) 1.54 Mbps is the guaranteed minimum transmission rate.
D) The dedicated line is using frame relay.

Question 8

What would an Asynchronous Transfer Mode (ATM) network be best suited for?

A) sending e-mail
B) downloading an RFC text file from the IETF web page
C) text messaging
D) carrying voice data and time-sensitive information

Question 9

A router is considered to be a CSU/DSU.

Question 10

What is the local loop, or last mile?

A) the connection used between central offices
B) cable between the customer premise equipment and a PC
C) a line used by ISPs for testing T-carrier signals.
D) the connection between the demarcation point and the CO

Question 11

Which of the following terms describes the category of cloud computing in which a customer develops applications using development tools and infrastructure provided by the service provider?

A) hosted development
B) hosted applications
C) hosted platforms
D) hosted infrastructure

Question 12

Which of the following is something X.25 does NOT offer?

A) SVCs
B) PVCs
C) error-free communication
D) 144 Mbps maximum throughput

Question 13

Which cloud computing category allows a company to quickly provision additional disk space?

A) hosted development
B) hosted applications
C) hosted platforms
D) hosted infrastructure

Question 14

Which cloud computing category refers to the use of software hosted on a service provider's network, and is usually subscription based?

A) hosted applications
B) hosted development
C) hosted platforms
D) hosted infrastructure

Question 15

Multiprotocol Label Switching (MPLS) supports both IPv4 and IPv6, as well as other network layer protocols.

Question 16

When would you most likely NOT choose to use a leased line connection?

A) when high-quality, 24/7 access is needed
B) for mission critical applications
C) when fast upstream as well as downstream communications is required
D) when a nondedicated link is needed for backups

Question 17

T-Carrier lines only require a CSU/DSU on the customer's side of the connection.

Question 18

Link Control Protocol is responsible for the setup of a PPP connection, as well as the termination of a connection when it has ended.

Question 19

Packet switched WANs use virtual circuits to ensure that packets are delivered reliably and at the agreed-on bandwidth level.

Question 20

You have been asked to install a VPN remote access solution using Windows Server.What do you need to install?

A) Microsoft Mobile User Service (MMUS)
B) Windows Server Remote Access (WSRA)
C) Routing and Remote Access Service (RRAS)
D) Dialup and Remote Access Services (DRAS)

Question 21

What is the signaling method used to allocate time slots for each channel in a T-carrier line called?

A) Time Division Multiplexing (TDM)
B) Time Divided Multimixing (TDM)
C) Time Slotted Modulation (TSM)
D) Time Fractionalized Division (TFD)

Question 22

You work for a large enterprise company that handles time-sensitive information. Your supervisor has asked that you set up a connection to be kept in stand-by until emergencies. He requests that the line have at least 1.544 Mbps for bandwidth. Describe what technology and format you'll want to use, and why this is the ideal choice for the situation described.

Question 23

What two protocols are used in PPP to handle higher protocol encapsulation and connection control? Describe these two protocols.

Question 24

Describe the difference between a digital signal and an analog signal.

Question 25

What is multiplexing, and where is it used?

Question 26

If a portion of a T-Carrier line is used for one purpose and a different portion for another purpose, the line has been ____________.

Question 27

MATCHING :

Question 28

What is a DCE, and what does it do?

Question 29

Part of SONET's flexibility comes from its ability to be arranged in several different physical topologies. Which of the following is NOT a possible SONET topology?

A) point to point
B) point to multipoint
C) fault tolerant bus
D) fault tolerant ring

Question 30

The plain old telephone service is a good example of what kind of WAN technology?

A) packet switched
B) leased line
C) VPN over Internet
D) circuit switched

Question 31

________________ is a PVC packet-switching technology that offers WAN communication over a fast, reliable, digital link. It was developed from X.25 and ISDN technology.

Question 32

Some of the most common packet-switched WAN network technologies are X.25, frame relay, and MPLS. Name and describe another packet switched WAN technology.

Question 33

Although a frame relay connection is established in much the same way that a T1 connection is, which of the following is an important distinction between the two technologies?

A) Frame relay is point to point, whereas T1 uses virtual circuits.
B) T1 uses point to point, while frame relay makes use of virtual circuits.
C) T1 connections are established using CSU/DSUs. Frame relay connections require a VPN service on the remote node.
D) T1 data traffic must all be transmitted in clear text, while frame relay encrypts data automatically and is more secure.

Question 34

The company you work for currently has ISDN service in place. Your supervisor wishes to know what sort of ISDN service is being used so that better alternatives can be considered. He tells you that the service has two B-Channels and a D-Channel. What ISDN format do you have?

A) Primary Rate Interface (PRI)
B) Basic Rate Interface (BRI)
C) Basic Rate Extended (BRE)
D) Asynchronous Transfer Mode (ATM)

Question 35

Describe how MPLS works.

Question 36

The CPE must be able to send data in the correct format onto the connection that makes up the ___________ and receives data coming from that connection.

Question 37

A __________ is a device that allows a computer, which works with digital information, to communicate over lines that use analog signals.

Question 38

What is the difference between the two types of virtual circuits?

Question 39

________ is a cell-based packet-switching technology in which the cells are of a fixed length rather than typical packet-based systems that use variable length packets.

Question 40

Explain how V.92 modems achieve 56 Kbps over traditional phone lines.

Question 41

Describe the X.25 technology.