Chapter 10 Carrier Wide Area Networks (WAN)

In ________, switching decisions are based on destination addresses. A) Ethernet B) PSDNs that use virtual circuits C) Both A and B D) Neither A nor B

A) Ethernet

Which of the following offers speeds that match speed range of greatest corporate demand for WAN transmission? A) Frame Relay. B) ATM. C) Both A and B D) Neither A nor B

A) Frame Relay.

A company has more control over its ________ technology. A) LAN B) WAN

A) LAN

A network that runs on the customer premises is a ________. A) LAN B) WAN C) Both A and B D) Neither A nor B

A) LAN

Which of the following usually offers higher speeds? A) LANs. B) WANs. C) Both A and B are about equal in typical speeds.

A) LANs.

According to the ITU, which of the following can be advertised as 4G? A) LTE. B) HSPA+. C) Both A and B D) Neither A nor B

A) LTE.

A customer's leased line to its ISP connects to the ISP's ________. A) POP B) NAP C) CSU/DSU D) interface

A) POP

Which of the following DSL services does not offer QoS guarantees? A) Residential. B) Business. C) Both A and B D) Neither A nor B

A) Residential.

Which of the following are more widely used? A) T1 lines. B) SONET lines. C) Both are used about equally.

A) T1 lines.

Service quality issues with the Internet can be addressed by using ________. A) a single ISP B) multiple ISPs

A) a single ISP

Leased lines standards are most different around the world at speeds ________. A) below about 50 Mbps B) above about 50 Mbps C) Leased line speeds around the world are about equally different in both speed ranges.

A) below about 50 Mbps

In cellular technology, a ________ is a small geographical area. A) cell B) cellsite C) both A and B D) neither A nor B

A) cell

Companies use carriers for WAN transmission because ________. A) companies lack rights of way B) carriers have extremely strong security C) Both A and B D) Neither A nor B

A) companies lack rights of way

Leased lines offer ________ service. A) fast B) any-to-any C) rapid-connection D) none of the above

A) fast

Compared to ADSL service, cable modem service typically is ________. A) faster and more expensive B) faster and less expensive C) slower and more expensive D) slower and less expensive

A) faster and more expensive

Metropolitan area Ethernet is used primarily ________. A) in MANs B) to link sites in distant cities C) Both A and B D) Neither A nor B

A) in MANs

A WAN is a network that ________. A) links different sites together B) provides service within about a mile C) provides service within a site D) All of the above

A) links different sites together

Carrier access lines to residential buildings typically use ________. A) one-pair voice-grade UTP B) two-pair voice-grade UTP C) two-pair data-grade UTP D) four-pair UTP

A) one-pair voice-grade UTP

SONET/SDH lines use ________. A) optical fiber B) high-quality forms of data-grade UTP C) Both A and B D) Neither A nor B

A) optical fiber

Leased lines are ________. A) point-to-point lines between two premises B) always on C) Both A and B D) Neither A nor B

A) point-to-point lines between two premises

Using the Internet as a WAN is attractive because of ________. A) the Internet's low cost per bit B) the Internet's service quality C) Both A and B D) Neither A nor B

A) the Internet's low cost per bit

In SDN, a switch receives its forwarding table rules directly from ________. A) the SDN controller B) an SDN management application C) another switch D) an SNMP manager

A) the SDN controller

Which of the following already runs to nearly all customer premises? A) 4-pair UTP. B) 1-pair VG UTP. C) 1-pair DG UTP. D) None of the above

B) 1-pair VG UTP.

E1 leased lines run at a speed of about ________. A) 250 kbps B) 2 Mbps C) 34 Mbps D) 45 Mbps

B) 2 Mbps

In ADSL, the residential customer needs a(n) ________. A) DSLAM B) ADSL modem C) Both A and B D) Neither A nor B

B) ADSL modem

Which of the following DSL services usually offers QoS guarantees? A) Residential. B) Business. C) Both A and B D) Neither A nor B

B) Business.

If I use Channel3 in a cell, I can reuse that same channel in an adjacent cell with ________. A) traditional cellular technology B) CDMA C) Both A and B D) Neither A nor B

B) CDMA

Which of the following does the carrier NOT own? A) The network core. B) Customer premises equipment. C) Both A and B D) Neither A nor B

B) Customer premises equipment.

On what full 4G standard are carriers converging? A) LTE. B) LTE Advanced. C) HSPA+. D) None of the above

B) LTE Advanced.

Which of the following offers true 4G speeds? A) LTE. B) LTE Advanced. C) HSPA+. D) All of the above

B) LTE Advanced.

Local loop access lines to business use which of the following transmission media? A) 1-pair data-grade UTP. B) Optical fiber. C) Both A and B D) Neither A nor B

B) Optical fiber.

The Internet is a ________. A) LAN B) WAN C) Both A and B D) Neither A nor B

B) WAN

Which of the following has more diversity in technologies? A) LANs. B) WANs. C) Both A and B are about equal in diversity of technologies.

B) WANs.

When a cellular customer moves from one cell in a city to another cell in the same city, this is ________. A) cell switching B) a handoff C) cell hopping D) roaming

B) a handoff

A router's load-balancing process is determined by ________. A) the SDN controller B) an SDN application C) the router D) any of the above

B) an SDN application

To connect two sites at 2.8 Mbps, I would use ________. A) a T1 line B) bonded T1 lines C) a T2 line D) a T3 line

B) bonded T1 lines

In cellular technology, the carrier antenna and equipment to which mobile customers connect directly is called a(n) ________. A) cell B) cellsite C) MTSO D) wireline carrier

B) cellsite

Two-way amplifiers are needed for cable ________ service. A) television B) data C) Both A and B D) Neither A nor B

B) data

OpenFlow can be used to standardize ________. A) northbound APIs B) southbound APIs C) both A and B D) neither A nor B

B) southbound APIs

Frame Relay frames contain ________. A) destination addresses B) virtual circuit numbers C) Both A and B

B) virtual circuit numbers

What speed does the LTE Advanced standard require downstream? A) 3 Mbps B) 30 Mbps C) 3 Gbps D) 30 Gbps

C) 3 Gbps

HSPA+ is a ________ service. A) 1G B) 2G C) 3G D) 4G

C) 3G

For surfing websites on the Internet, what is the lowest generation of cellular service that would provide at least reasonably good access? A) 1G. B) 2G. C) 3G. D) 4G.

C) 3G.

A firm uses a PSDN. It has four sites. How many leased lines will it need? A) None B) 1 C) 4 D) None of the above

C) 4

LANs are ________. A) single networks B) internets C) Either A or B D) Neither A nor B

C) Either A or B

WANs are ________. A) single networks B) internets C) Either A or B D) Neither A nor B

C) Either A or B

Forwarding functions are located in routers in ________. A) traditional routing B) SDN C) both A and B D) neither A nor B

C) both A and B

ATM ________. A) offers speeds in the range of greatest corporate demand B) is relatively inexpensive C) Both A and B D) Neither A nor B

D) Neither A nor B

In coaxial cable, the two conductors ________. A) run side-by-side B) are twisted around each other C) Both A and B D) Neither A nor B

D) Neither A nor B

The highest layer in SDN consists of ________. A) switches B) routers C) the SDN controller D) SDN applications

D) SDN applications

WAN prices are closely related to carrier costs.

FALSE

Many "T1" lines that carriers provide today use ________ in the local loop. A) 1-pair voice-grade UTP B) 2-pair voice-grade UTP C) 1-pair data-grade UTP D) 2-pair data-grade UTP

A) 1-pair voice-grade UTP

Which of the following is in Frame Relay's speed range? A) 10 Mps. B) 100 Mbps. C) Both A and B D) Neither A nor B

A) 10 Mps.

Which of the following is a fractional T1 line speed? A) 128 kbps. B) 1 Mbps. C) Both A and B D) Neither A nor B

A) 128 kbps.

T1 leased lines run at a speed of about ________. A) 250 kbps B) 1 Mbps C) 10 Mbps D) 45 Mbps

A) 250 kbps

For ADSL service, which of the following typically must be added to the telephone system? A) A DSLAM. B) A transmission line to the customer premises. C) Both A and B D) Neither A nor B

A) A DSLAM.

WAN optimization devices are deployed ________. A) at the ends of leased lines B) by the telephone carrier C) by the PSDN carrier

A) at the ends of leased lines

The use of virtual circuits ________. A) reduces costs B) improves reliability C) Both A and B D) Neither A nor B

A) reduces costs

When a cellular customer moves from one city to another, this is ________. A) roaming B) a handoff C) Both A and B D) Neither A nor B

A) roaming

Fiber to the home service is normally created by ________. A) running optical fiber to neighborhoods B) running individual fiber cords from the nearest switching building to individual homes C) Both A and B D) Neither A nor B

A) running optical fiber to neighborhoods

Cells are used in cellular telephony to provide ________. A) service for more customers B) greater reliability C) greater speed D) All of the above

A) service for more customers

LAN speeds are faster than WAN speeds. This is because of ________. A) technological limitations B) regulatory limitations C) the slow corporate adoption of newer WAN technologies D) economics

A) technological limitations

Which of the following DSL services tend to be symmetric in speed? A) Residential. B) Business. C) Both A and B D) Neither A nor B

B) Business.

In the United States, to get a leased line of at least 2.5 Mbps. Your access line would be ________. A) T1 B) Fractional T1 C) Bonded T1s D) None of the above

C) Bonded T1s

An MTSO ________. A) controls cellsites in a cellular system B) links mobile users to wired telephone customers C) Both A and B D) Neither A nor B

C) Both A and B

In ADSL, the customer should have ________. A) splitters B) an ADSL modem C) Both A and B D) Neither A nor B

C) Both A and B

Leased line switched WANs typically use ________. A) leased lines B) a router at each site C) Both A and B D) Neither A nor B

C) Both A and B

Which of the following go from one customer site to another customer site? A) Leased lines. B) Access lines. C) Both A and B

C) Both A and B

Why is metro Ethernet popular? A) Familiarity. B) Rapid reprovisioning. C) Both A and B D) Neither A nor B

C) Both A and B

Why is metro Ethernet popular? A) It uses a familiar technology. B) It has attractive prices. C) Both A and B D) Neither A nor B

C) Both A and B

What transmission medium do ALL DSL services use? A) One-pair data-grade UTP. B) Two-pair data-grade UTP. C) One-pair voice-grade UTP. D) Two-pair voice-grade UTP.

C) One-pair voice-grade UTP.

In a PSDN, companies connect to the network core at ________. A) NAPs B) Public/Private access points C) POPs D) DSLAMs

C) POPs

Combining multiple WAN technologies into a collectively managed system is called having ________. A) SNMP B) network visibility C) a virtual WAN D) WAN optimization

C) a virtual WAN

The PSDN transport core normally is drawn as a cloud ________. A) because it has no internal structure B) for security reasons C) because customers do not need to care about what is inside it D) All of the above

C) because customers do not need to care about what is inside it

SDN can ________. A) permit routing rules to be changed rapidly B) reduces router costs C) both A and B D) neither A nor B

C) both A and B

Traffic shaping ________. A) limits the amount of some types of traffic B) does not admit some types of traffic C) both A and B D) neither A nor B

C) both A and B

Which of the following affects what throughput an individual user will receive? A) being in a moving car B) being far from the cellsite C) both A and B D) neither A nor B

C) both A and B

For their transmission medium, cable television companies primarily use ________. A) 2-pair VG UTP cabling B) 2-pair DG UTP cabling C) coaxial cable D) 4-pair UTP

C) coaxial cable

According to the ITU, which of the following offers true 4G speeds? A) LTE. B) HSPA+. C) Both A and B D) Neither A nor B

D) Neither A nor B

ADSL offers symmetric service.

FALSE

By regulation, cellular systems must give almost the same throughput at different places in their service areas.

FALSE

By regulation, cellular systems must give almost the same throughput at different times during the day.

FALSE

If I use Channel3 in a cell, I can reuse that same channel in an adjacent cell with traditional cellular technology.

FALSE

In cellular technology, a cellsite is a small geographical area.

FALSE

The slowest offered SONET/SDH leased lines run at about 50 Mbps.

FALSE

UTP transmission is normally limited to about 100 meters.

FALSE

39) DSL throughput is typically sensitive to distance from the nearest switching building.

TRUE

All SONET/SDH leased lines run faster than 50 Mbps.

TRUE

Cellular carriers are happy when flat fee users use a corporate 802.11 LAN to place calls instead of using the carrier network.

TRUE

Cellular technology was created to support more customers in a single area.

TRUE

Metro Ethernet offers relatively high speeds and low costs.

TRUE

Some smart phones can act as wireless access points.

TRUE

The general name for a company that is given rights of way to lay wires through public areas is carrier.

TRUE

To deliver signals to individual residences, cable television companies primarily use coaxial cable.

TRUE

To use your smartphone as a wireless access point today generally will require you to pay a larger monthly fee.

TRUE

In MPLS, the packet travels along the ________. A) route B) data link C) label-switched path D) MPLS path

C) label-switched path

The PSTN core is organized as a ________. A) mesh B) hierarchy C) modified hierarchy D) loop

C) modified hierarchy

A LAN is a network that ________. A) links different sites together B) provides service within about a mile C) provides service within a site D) All of the above

C) provides service within a site

Low-speed leased lines use ________ transmission lines to the customer premises. A) one-pair voice-grade UTP B) one-pair data-grade UTP C) two-pair data-grade UTP D) four-pair UTP

C) two-pair data-grade UTP