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ISDN1 > Ch. 3 Fundamentals Of WANs > Flashcards

Ch. 3 Fundamentals Of WANs Flashcards

0
Q

How do LANs connect together using a WAN?

A

Via a router connected to each LAN with a WAN link between the routers

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1
Q

What do WANs do?

A

Forward data between two routers

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2
Q

How do you represent a leased line in a diagram

A

With a crooked line

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3
Q

A leased line delivers ____ in both directions using _____ _____

A

Bits, full duplex

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4
Q

A ____ _____ refers to a network a company pays to rent

A

Leased line

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5
Q

Today people refer to their leased lines as _____ _____ as a generic term

A

Service provider

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6
Q

Least circuit, circuit, serial link, serial line, point-to-point links, point to point line, T1, WAN link, link, private line are all types of

A

Leased lines

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7
Q

CO

A

Central office

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8
Q

CPE

A

Customer premises equipment

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9
Q

What does the CPE include

A

The router, serial interface card, and CSU/DSU

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10
Q

CSU

A

Channel service unit

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11
Q

DSU

A

Data service unit

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12
Q

DTE

A

Data terminal equipment (cables)

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13
Q

The serial cables normally used between a router and external CSU/DSU are called

A

Data terminal equipment (DTE)

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14
Q

DCE

A

Data communications equipment (cable) DCE

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15
Q

Leased lines provide what layer of service

A

Layer 1 physical

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16
Q

HDLC

A

High-level data link control

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17
Q

PPP

A

Point-to-point protocol

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18
Q

SP

A

Service provider

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19
Q

POP

A

Point of presence

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20
Q

EoMPLS

A

Ethernet emulation and ethernet over MPLS

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21
Q

MPLS

A

Multiprotocol label switching

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22
Q

What does EoMPLS provide

A

A point to point connection between two customer devices

Behavior as if a fiber ethernet link existed between the two devices

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23
Q

What are the two most popular data link layer protocols used for leased lines

A

High-level datalink control HDLC and PPP point to point protocol

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24
Q

Today most leased lines connect to _____

A

Routers

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25
Q

Routers focus on delivering packets to a

A

Destination host

26
Q

A leased line with _____ creates a WAN link between two routers so that they can forward packets for the devices on the attached LANs

A

HDLC

27
Q

What are the two names the CCENT and CCNA go by:

A

Ethernet emulation and ethernet over MPLs (EoMPLS)

28
Q

The EoMPLS service provides

A

A point-to-point connection between two customer devices

Behavior as if a fiber ethernet link existed between the two devices

29
Q

The EoMPLS link uses ethernet for both ______ and ______ functions

A

Layer 1 and layer 2

30
Q

In networking terms the Internet is simply one huge _____ network

A

TCP/IP

31
Q

The middle of the Internet is called

A

The Internet core

32
Q

Who owns the Internet core

A

Internet service providers (ISP)

33
Q

Enterprise TCP/IP networks use _____ ______

A

Leased lines

34
Q

SOHO TCP/IP networks use _____ and _____

A

DSL and cable

35
Q

Businesses primarily use ______ networks but can also use cable and DSL

A

Enterprise TCP/IP

36
Q

All three of the Internet access technologies happen use a pair of _____. One of the customer side of the WAN link and one at the ISP side

A

Routers

37
Q

DSL

A

Digital subscriber line

38
Q

DSLAM

A

DSL access multiplexer

39
Q

ISP towards the home

A

Downstream

40
Q

Transmissions towards the ISP

A

Upstream

41
Q

In DSL the downstream is much _____ compared to the upstream

A

Faster

42
Q

WANs and LANs match which OSI layers

A

Layer 1 physical and layer 2 data link

43
Q

WANs can connect devices that can Far apart, even ______ or _____ of ______

A

Hundreds or thousands of miles

44
Q

The term lease liner first effect of the company using the least like does not____ the line but pays a monthly service to use it

A

Own

45
Q

People today use the generic term ____ to refer to a company that provides any form of WAN connectivity

A

Service provider

46
Q

Each site has a _____ which includes the router serial interface card and CSU/DSU

A

Customer premise equipment (CPE)

47
Q

You treader uses a serial interface card the basically acts like a ______ ______ sending and receiving data over the physical link

A

Ethernet NIC

48
Q

The physical link requires a function called a ______ _____ ______/______ ______ ______

A

Channel service unit(CSU)/data service unit(DSU)

49
Q

The CSU/DSU normally provide a function called _______ in which it tells the router exactly when to send each bit by signaling over the serial cable

A

Clocking

50
Q

A router serial interface can provide clocking, but the router does not do so unless configured with the _____ ______ command

A

Clock rate

51
Q

A leased line with ______ protocol creates a ______ link between to routers so they can forward packets for the devices on the attached LANs

A

HDLC

WAN

52
Q

The leased line itself provides the ______ means to transmit the bits in both directions

A

Physical

53
Q

The ______ frames provide the means to encapsulate the network layer packet correctly so it crosses the link between routers

A

HDLC

54
Q

What are the two names of the ethernet WAN service used for the CCNA

A

Ethernet emulation and ethernet over MPLS (EoMPLS)

55
Q

DSL uses ______ ______ telephone line use for a typical home phone

A

Single pair

56
Q

The main function of OSI layer 1 (physical)using WANs is

A

Delivery of bits from one device to another

57
Q

In the cabling for a leased line what typically connect to a four wire line provided by Telco

A

CSU/DSU

58
Q

An accurate speed at which at leased line can operate in the United States is

A

256 Kbps

59
Q

What field does Cisco routers add beyond the ISO and standard HDLC

A

Type

60
Q

Two routers R1 and R2 connect using an ethernet over and MPLS service. The service provides point-to-point service between these two routers only as a layer 2 ethernet service. Name two things that are likely to be true about this WAN

A

R1 will connect to a physical ethernet link with the other end of the cable connected to the device with the WAN service provider point of presence

R1 will forward data link frames to R2 using an ethernet Header/trailer

61
Q

Name two Internet access technologies used to connect to a site on an ISP that offer asymmetric speed

A

DSL and cable

62
Q

Fred has just added DSL service at his home with a separate DSL modem and consumer grade router with four ethernet ports. Fred wants to use the same old phone he was using before the installation of DSL. What is most likely true about the phone cabling and phone used with his new DSL installation

A

He uses the old phone cabled to an existing telephone cord and not to any new device

63
Q

What is a telco

A

Telephone Company

ISDN1 (28 decks)

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