Chapter 10 Carrier Wide Area Networks (WANs)

Compared to the Internet, Layer 2 and Layer 3 carrier WAN services usually ________.

both A and B (offer QoS guarantees & require less management labor in the customer organization)

Traffic shaping reduces traffic by ________.

both A and B (preventing certain undesirable traffic from entering the network & limiting the amount of certain undesirable traffic entering the network)

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

cell

Compression reduces traffic by ________.

reducing redundancy in the data

MPLS brings ________.

the ability to do traffic engineering

MPLS is ________ the source and destination hosts.

transparent to

Decent data transmission for Web surfing began with ________ technology.

3G

Which generation is now bringing speeds of about 10 Mbps?

4G

Most end-office switches are Class ________ switches.

5

In ADSL, the residential customer needs a(n) ________.

ADSL modem

Which spends less processing time on each packet arriving at a router?

MPLS

Which of the following has more diversity in technologies?

WANs

In MPLS, the router interface to send the packet back out will be decided ________.

before the first data packet is sent

In Carrier Ethernet, which connects multiple distant sites into a single Ethernet network?

E-LAN service

In Carrier Ethernet, which service is a competitor for leased line service?

E-Line

When carriers use the terms "4G" and "5G," they use these terms in ways that comply with standards.

FALSE

A company has more control over its ________ technology.

LAN

A network that runs on the customer premises is a ________.

LAN

Which of the following usually offers higher speeds?

LANs

Which of the following is the most expensive to use?

MPLS

A customer's leased line to its ISP connects to the ISP's ________.

POP

Many T1 lines are ________.

Symmetric DSL lines

If you need speeds of 1.2 Mbps between two corporate sites in the United States, you would need a ________ leased line.

T1

If you need speeds of 16 Mbps between two corporate sites in the United States, you would need a ________ leased line.

T3

In MPLS, the label-switched routers in the middle do not look at a packet's IP address.

TRUE

How do WAN carriers typically get their trunk lines?

They lease them from telephone companies.

The Internet is a ________.

WAN

For ADSL service, which of the following typically must be added to the telephone system?

a DSLAM

If a cellsite uses Channel 237, which other cellsites can reuse the channel?

adjacent cellsites

DSL residential service provides ________.

asymmetric speed

WAN optimization devices are deployed ________.

at the ends of leased lines

Firms generally pay the added cost of MPLS for connecting their sites ________.

because it can do traffic engineering

Fiber to the home service is normally offered by ________.

both A and B (cable television companies & telephone companies)

Which of the following reduces traffic?

both A and B (compression & traffic shaping)

An MTSO ________.

both A and B (controls cellsites in a cellular system & links mobile users to wired telephone customers)

5G will bring ________.

both A and B (higher speeds than 4G & energy-efficient low speeds)

In ADSL, the customer should have ________.

both A and B (splitters, an ADSL modem)

Which of the following is a common use for carrier WANs?

both A and B (to connect corporate sites, to connect a corporate site to the Internet)

DSL offers ________.

both A and B (voice transmission & data transmission)

Which of the following DSL services tends to be symmetric in speed?

business

For cable modem service, customers need ________.

cable modems

Which reduces traffic more when sending long files?

caching

Which of the following receive rights of way for transmission beyond sites?

carriers

In cellular technology, the carrier antenna and equipment to which mobile customers connect directly is called a(n) ________.

cellsite

For their transmission medium, cable television companies primarily use ________.

coaxial cable

hich of the following does the carrier NOT own?

customer premises equipment

Two-way amplifiers are needed for cable ________ service.

data

In MPLS, if two packets arrive in order going to the same IP address, MPLS will ________.

do a simple table lookup for the second packet

In coaxial cable, the two conductors ________.

neither A nor B (run side-by-side, are twisted around each other)

Compared to the Internet, carrier WANs ________.

offer higher-quality service

What transmission medium do ALL DSL services use?

one-pair voice-grade UTP

Traffic shaping reduces traffic by ________.

preventing or limiting undesirable traffic from entering the network

MPLS ________ the work that each router must do to deliver a packet during a traffic exchange.

reduces

Cells are used in cellular telephony to provide ________.

service for more customers

Which of the following allows you to connect to the hosts of almost any corporation today?

the Internet

Asymmetric residential service is good for ________.

the World Wide Web

In a telephone system, the lines that connect customers to the nearest switch are called ________.

the local loop

T1 leased lines run at a speed of about ________.

1 Mbps

Which of the following already runs to nearly all customer premises?

1-pair VG UTP

Many lines sold as T1 lines actually use ________.

1-pair voice-grade UTP

Leased lines offer ________ service.

fast

To use a leased line, the customer must have a(n) ________ at each site.

CSU/DSU

Which of the following is moving toward FTTH?

both A and B (cable modem service companies & ADSL service companies)

Which of the following can sometimes be accelerated by changing their operation?

both A and B (Application protocols & Network protocols)

How does carrier Ethernet differ from traditional Ethernet?

both A and B (It is offered by carriers instead of being installed and managed by the company using it. And it is for MAN and WAN services.)

Why is Carrier Ethernet popular?

both A and B (It uses a familiar technology. & It is usually easy to upgrade speed rapidly.)

Why is Carrier Ethernet popular?

both A and B (It uses familiar technology. And It has attractive prices.)

Which of the following affects what cellular throughput an individual user will receive?

both A and B (being in a moving car & being far from the cellsite)

LAN speeds are faster than WAN speeds because of ________.

economic reasons

MAN speeds are faster than WAN speeds because of ________.

economic reasons

LANs are ________.

either A or B (single networks, local internets)

WANs include ________.

either A or B (single networks, the Internet)

Compared to ADSL service, cable modem traditionally has been ________.

faster and more expensive

In MPLS, the ________ adds the label to the packet.

first label-switching router

In cellular technology, G stands for ________.

generation

The promise of FTTH is ________.

higher speed

MPLS routers base their decisions on a packet's ________.

label number

Which lines run from one customer premise to another?

leased lines

A WAN is the network that ________.

links different sites together

The PSTN core is organized as a ________.

modified hierarchy

Why is Carrier Ethernet popular?

uses a familiar technology