Ch. 3 Fundamentals Of WANs Flashcards Preview

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Flashcards in Ch. 3 Fundamentals Of WANs Deck (64):
0

What do WANs do?

Forward data between two routers

1

How do LANs connect together using a WAN?

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

2

How do you represent a leased line in a diagram

With a crooked line

3

A leased line delivers ____ in both directions using _____ _____

Bits, full duplex

4

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

Leased line

5

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

Service provider

6

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

Leased lines

7

CO

Central office

8

CPE

Customer premises equipment

9

What does the CPE include

The router, serial interface card, and CSU/DSU

10

CSU

Channel service unit

11

DSU

Data service unit

12

DTE

Data terminal equipment (cables)

13

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

Data terminal equipment (DTE)

14

DCE

Data communications equipment (cable) DCE

15

Leased lines provide what layer of service

Layer 1 physical

16

HDLC

High-level data link control

17

PPP

Point-to-point protocol

18

SP

Service provider

19

POP

Point of presence

20

EoMPLS

Ethernet emulation and ethernet over MPLS

21

MPLS

Multiprotocol label switching

22

What does EoMPLS provide

A point to point connection between two customer devices

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

23

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

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

24

Today most leased lines connect to _____

Routers

25

Routers focus on delivering packets to a

Destination host

26

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

HDLC

27

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

Ethernet emulation and ethernet over MPLs (EoMPLS)

28

The EoMPLS service provides

A point-to-point connection between two customer devices

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

29

The EoMPLS link uses ethernet for both ______ and ______ functions

Layer 1 and layer 2

30

In networking terms the Internet is simply one huge _____ network

TCP/IP

31

The middle of the Internet is called

The Internet core

32

Who owns the Internet core

Internet service providers (ISP)

33

Enterprise TCP/IP networks use _____ ______

Leased lines

34

SOHO TCP/IP networks use _____ and _____

DSL and cable

35

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

Enterprise TCP/IP

36

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

Routers

37

DSL

Digital subscriber line

38

DSLAM

DSL access multiplexer

39

ISP towards the home

Downstream

40

Transmissions towards the ISP

Upstream

41

In DSL the downstream is much _____ compared to the upstream

Faster

42

WANs and LANs match which OSI layers

Layer 1 physical and layer 2 data link

43

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

Hundreds or thousands of miles

44

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

Own

45

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

Service provider

46

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

Customer premise equipment (CPE)

47

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

Ethernet NIC

48

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

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

49

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

Clocking

50

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

Clock rate

51

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

HDLC
WAN

52

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

Physical

53

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

HDLC

54

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

Ethernet emulation and ethernet over MPLS (EoMPLS)

55

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

Single pair

56

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

Delivery of bits from one device to another

57

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

CSU/DSU

58

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

256 Kbps

59

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

Type

60

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

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

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

DSL and cable

62

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

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

63

What is a telco

Telephone Company