Deck 12: Wide Area Networks

Question 1

 The word "synchronous" as used in the name of Synchronous Optical Network means that data being transmitted and received by nodes must conform to a timing scheme.

Answer 1

True

Question 2

 Although MPLS can operate over Ethernet frames, it is more often used with other Layer 2 protocols, like those designed for WANs.

Answer 2

True

Question 3

 In a frame relay WAN, the ISP typically has the data circuit terminating equipment (DCE).

Answer 3

True

Question 4

 The DTE or endpoint device for a leased line is known as which device below?

A) CSU/DSU
B) cable modem
C) DSL modem
D) ISDN modem

Question 5

 In an ISDN connection, what amount of throughput did a single B channel provide?

A) 32 Kbps
B) 48 Kbps
C) 64 Kbps
D) 96 Kbps

Question 6

 An 802.11ac signal can travel for approximately 2 miles from the source.

Question 7

 Which of the following is an advantage of leasing a frame relay circuit over leasing a dedicated circuit?

A) You are guaranteed to receive the maximum amount of bandwidth specified in the circuit contract
B) You pay only for the bandwidth you require.
C) The paths that your data will take are always known.
D) Frame relay is a newly established network technology with more features than other technology.

Question 8

 In metro settings, end-to-end, carrier-grade Ethernet networks can be established via what protocol?

A) Metro Carrier Transport
B) Carrier Ethernet Transport
C) Intra-city Ethernet
D) Ethernet SONET

Question 9

 What is the size of an ATM cell, including the header?

A) 48 bytes
B) 53 bytes
C) 64 bytes
D) 84 bytes

Question 10

 Most satellites circle the Earth 22,300 miles above the equator in a geosynchronous orbit.

Question 11

 Multiplexing enables a single T1 circuit to carry how many channels?

A) 1
B) 12
C) 24
D) 64

Question 12

 What OC level is primarily used as a regional ISP backbone, and occasionally by very large hospitals, universities, or other major enterprises?

A) OC-3
B) OC-12
C) OC-48
D) OC-96

Question 13

 WANs connect nodes, such as workstations, servers, printers, and other devices, in a small geographical area on a single network.

Question 14

 The C-Band utilized by satellites consists of what frequency range?

A) 1.5 - 2.7 GHz
B) 2.7 - 3.5 GHz
C) 3.4 - 6.7 GHz
D) 12 - 18 GHz

Question 15

 CDMA (Code Division Multiple Access) is an open standard that is accepted and used worldwide.

Question 16

 In a public switched telephone network, lines are terminated at the central office.

Question 17

 Of all the DSL standards, which is the most commonly in use today?

A) ADSL
B) VDSL
C) SDSL
D) G.Lite

Question 18

 DSL signals travel over telephone lines using the 300 to 3300 Hz frequency range.

Question 19

 DSL services require many subscribers to share the same local line, causing potential security concerns.

Question 20

 What is the maximum throughput of a DS3 connection?

A) 1.544 Mbps
B) 3.152 Mbps
C) 44.736 Mbps
D) 274.176 Mbps

Question 21

 On an ATM network, how is the path that data will take determined?

A) Switches determine the optimal path between sender and receiver, and then establish the path before transmission.
B) Data is transmitted, and then the path taken will vary depending on the load encountered at each ATM participant node.
C) A frame relay route table establishes each hop that will be taken to a single destination.
D) When data is ready to be transmitted, an ATM participating router will contact the destination ATM router, establish a tunnel, then pass the data.

Question 22

 How many transponders are contained within a typical satellite?

A) 8 to 16
B) 16 to 24
C) 24 to 32
D) 32 to 48

Question 23

 In a cellular network, where does each wireless base station connect to?

A) They connect directly to the central office.
B) They connect to a mobile switching center.
C) They connect to other wireless base stations, then to the central office.
D) They connect to a wireless station repeater.

Question 24

 When using satellite services for your WAN connection, what statement is accurate?

A) Satellite downlink rates range from 50 to 100 Mbps.
B) Satellite services suffer more latency and jitter issues.
C) Satellite services are only available for fixed location clients.
D) Satellite uplink rates range from 5 to 10 Mbps.

Question 25

 The Global System for Mobile Communications (GSM) utilizes what technology to create timeslots on a channel?

A) frequency division multiplexing (FDM)
B) wavelength division multiplexing (WDM)
C) dense wavelength division multiplexing (DWDM)
D) time division multiple access (TDMA)

Question 26

 Which SONET OC level is a popular choice for large businesses, and is equivalent to 100 T1s?

A) OC-1
B) OC-3
C) OC-12
D) OC-24

Question 27

 In a public switched telephone network, what portion of the network is known as the local loop?

A) It is the inside wire within the residence or business that connects to the NIU.
B) It is the portion of the network between the NIU and the remote switching facility.
C) It is the portion of the network from the remote switching facility to the central office.
D) It is the portion that connects any residence or business to the nearest central office.

Question 28

 Which statement regarding the Asynchronous Transfer Mode (ATM) technology is accurate?

A) In ATM, a message is called a frame and always consists of 1500 bytes of data.
B) ATM can provide 4 levels of QoS, from best effort delivery to guaranteed, real-time transmission.
C) ATM is highly dependent on predetermined schemes that specify the timing of data transmissions.
D) ATM is a point-to-multipoint WAN access technology that uses packet switching.

Question 29

 With a SIP trunk, what is the only limitation on the number of calls that can run at any one time?

A) The maximum number of channels available on the transmission medium.
B) The total number of time division slots allocated to the SIP client organization.
C) The total number of SIP bearer channels provisioned on the SIP switch.
D) The amount of available bandwidth.

Question 30

 Considering that multiple users occupy the same channel when using CDMA, how are various calls using this technology kept separate?

A) The packets are coded such that individual calls can be distinguished.
B) The packets include the end user's SIM IMEI in each packet.
C) The sending and receiving of data is performed on different frequencies. Users hop between these frequencies to avoid interference.
D) The transmissions are encrypted, such that only the appropriate device can decrypt its own call.

Question 31

 Which of the following Layer 1 WAN technologies is not normally used as last mile service, but rather traverses multiple ISP networks, connecting these networks to the Internet backbone?

A) SONET (Synchronous Optical Network)
B) T-carrier (T1s, fractional T1s, and T3s)
C) Carrier-Ethernet Transport (CET)
D) digital subscriber line (DSL)

Question 32

 The T-carrier standards, also called T-CXR standards, utilize what type of multiplexing over two wire pairs to create multiple channels?

A) wavelength division multiplexing (WDM)
B) frequency division multiplexing (FDM)
C) orthogonal frequency division multiplexing (OFDM)
D) time division multiplexing (TDM)

Question 33

 When using DOCSIS 3.0, what is the minimum number of channels that can be used?

A) 1
B) 2
C) 4
D) 16

Question 34

 What type of virtual circuit allows connections to be established when parties need to transmit, then terminated after the transmission is complete?

A) permanent virtual circuit (PVC)
B) switched virtual circuit (SVC)
C) dynamic virtual circuit (DVC)
D) looping virtual circuit (LVC)

Question 35

 Which type of DSL technology has equal download and upload speeds maxing out at around 2 Mbps?

A) ADSL2+
B) VDSL
C) HDSL
D) SDSL

Question 36

 What is a data-link connection identifier (DLCI) utilized for?

A) It is used by routers to determine which circuit to forward a frame to in a frame relay network.
B) It is used by routers to establish a packet-switched path to the destination.
C) It is used by ATM switches to determine how to create a switched virtual circuit.
D) It is a locally significant ID used to send connectionless information.

Question 37

 In North America, what ISDN connection type used two B channels and one D channel?

A) Basic Rate Interface (BRI)
B) Primary Rate Interface (PRI)
C) Bearer Rate Interface (BRI)
D) Dedicated Rate Interface (DRI)

Question 38

 Which statement regarding the use of cable modems is NOT accurate?

A) Modems that utilize the DOCSIS 3.0 or 3.1 standard are backward compatible with older DOCSIS networks.
B) DOCSIS 3.1 allows for full duplex speeds up to 10 Gbps.
C) Cable modems only operate at the Physical layer of the OSI model.
D) Cable broadband provides a dedicated and continuous connection.

Question 39

 A fractional T1's bandwidth can be leased multiples of what data rate?

A) 28 Kbps
B) 32 Kbps
C) 48 Kbps
D) 64 Kbps

Question 40

 Where are MPLS labels placed within a frame?

A) between the layer 3 header and the data payload
B) between the data payload and the layer 2 trailer
C) between the layer 2 header and the layer 3 header
D) at the end of the layer 2 trailer

Question 41

 How is ATM able to guarantee a specific QoS for certain types of transmissions?

Question 42

 What is the difference between a DTE and a DCE?

Question 43

 Describe the Synchronous Optical Network standard.

Question 44

 How does a LAN connection differ from a WAN connection?

Question 45

 List and describe the four different generations of cellular technology.

Question 46

 What is the MPLS standard, and why is it often used by ISPs to move traffic from one customer site to another?

Question 47

 Describe the HSPA+ (High Speed Packet Access Plus) and LTE (Long Term Evolution) cellular networking technologies.

Question 48

 What is the role of a multiplexer when working with T-carrier lines?

Question 49

 The NIU (network interface unit) or NID (network interface device) at the ISP's demarc serves what purpose?

Question 50

 All ISDN connections were based on what two different types of channels?