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Flashcards in Chapter 3 Flashcards - Sheet1 Deck (25):
1

Name the different terms for a leased line

Leased circuit, serial link/line, point-to-point link/line, T1, WAN link, private line

2

T1

Type of leased line that transmits at 1.545Mbps

3

CO

Central Office - Location of equipment for telcos providing leased lines

4

CSU/DSU

Channel Service Unit / Data Service Unit (Modem / Connection equipment to a WAN)

5

CPE

Customer Presmises Equipment

6

Examples of CPE:

Router, serial interface card, CSU/DSU. The CSU/DSU may be integrated into the serial interface card in the router.

7

Typical connection from a telco to the CSU/DSU

RJ-48

8

DTE Cables

Data terminal equipment cables. Serial cables normally used between a router and an external CSU/DSU

9

DTE Cable equivalent of a crossover cable

DCE - Data Communications Equipment Cable

10

Clocking

Function of the CSU/DSU that tells the router when to send each bit through signaling over a serial cable.

11

Two most popular data link layer protocols used for leased lines (WANs) are

HDLC (High Level Data Link Control) and PPP (Point to Point Protocol), Ethernet WANs(!)

12

All data link protocols perform this similar role

Control correct delivery of data over a physical link of a particular type.

13

HDLC frames have less work to do than Ethernet because --

The source and destination are implied. There are only two endpoints. Despite this, HDLC still has an address field, b/c telcos used to offer multidrop circuits w/more than 2 devices

14

Lists the HDLC fields and their Ethernet equiv

Flag (Preamble), Address (Destination Address), Type (Type), Data (Data), FCS (FCS)

15

Size of the HDLC's flag

1 byte

16

Size of the HDLC's Address

1 byte

17

Size of the HDLC's type

2 bytes

18

Size of the HDLC's FCS

2 bytes

19

Size of the HDLC's control

1 byte

20

EoMPLS

Ethernet Over MPLS. AKA Ethernet Emulation. An Ethernet WAN service.

21

DSLAM

DSL Access Multiplexer - Housed at the TelCo's central office, splits phone from data traffic. Sends phone traffic through PSTN, sends data through a router.

22

DSL speeds are ______, meaning the down speed is different than the up speed

Asymmetric

23

Telco

Telephone Company

24

Leased Line

A serial communications circuit between two points, provided by some service provider,
typically a telephone company (telco)

25

Serial Interface

A type of interface on a router, used to connect to some types of WAN links, particularly leased
lines and Frame Relay access links.