Chap_6

Question 1

DSL?

Answer 1

Digital Subscriber Lines

Question 2

what is Broadband transmission?

Answer 2

internet access via cable, DSL, fiber to the home, wireless and satellite.
*providing high-speed transmission of services, such as data, voice, and video, over the Internet and other networks

Question 3

CMTS?

Answer 3

cable modem termination system

Question 4

CM>?

Answer 4

Cable Modem

Question 5

Teleworking?

Answer 5

workers use internet and VPN’s to access the business network remotely and work from home or when traveling.

Question 6

how common are IPsec VPNS?

Answer 6

IPsec = ip security virtual private networks, very common for teleworkers. **works on the layer 3 network layer to provide security.

Question 7

what protocol technologies are used in a traditional WAN layer 2 technology?

Answer 7

Frame Relay, ATM, etc. the service provider is responsible for the level of security provided to customer.

Question 8

RF?

Answer 8

Radio Frequencies.. used by cable to carry signals.

Question 9

CAT?

Answer 9

Community Antenna Television: one antenna connects to several customers so they can all receive signals from a cable station.

Question 10

HFC?

Answer 10

Hybrid Fiber-Coaxial networks:

- provides high speed communication both ways and does data, video and voice transmission.

Question 11

SOHO

Answer 11

small office home office network

Question 12

Downstream -when talking about cable signals?

Answer 12

direction of RF signal transmission such as TV channels from source. 50-860 MHz.

Question 13

Upstream?

Answer 13

direction of R signal transmissions from subscriber to the provider. 5-42 MHz.

Question 14

DOCSIS?

Answer 14

The Data-over-Cable Service Interface Specification:
— allows the use of high speed data transfer over existing CATV systems. provides internet access over the existing HFC infrastructure.

Question 15

(TDMA

Answer 15

Time-Division Multiple Access :deterministic access method

Question 16

(S-CDMA)

Answer 16

synchronous Code Division Multiple Access method (S-CDMA):

–deterministic access method

Question 17

CMTS

Answer 17

Cable Modem Termination System (CMTS) at the headend of the cable operator

Question 18

(CM

Answer 18

Cable Modem (CM) on the subscriber end

Question 19

(ADSL)

Answer 19

asymmetric DSL:

–ADSL provides higher downstream bandwidth to the user than upload bandwidth

Question 20

SDSL

Answer 20

symmetric DSL

–provides the same capacity in both directions.

Question 21

CPE)

Answer 21

customer premises equipment

Question 22

DSLAM

Answer 22

DSL access multiplexer :
Located at the CO of the carrier, the DSLAM combines individual DSL connections from users into one high-capacity link to an ISP, and therefore, to the Internet.

Question 23

Transceiver

Answer 23

Connects the computer of the teleworker to the DSL. Usually the transceiver is a DSL modem connected to the computer using a USB or Ethernet cable

Question 24

WiMAX

Answer 24

Worldwide Interoperability for Microwave Access

Question 25

Municipal Wi-Fi

Answer 25

Municipal Wi-Fi (Mesh): Most municipal wireless networks use a mesh topology rather than a hub-and-spoke model. A mesh is a series of interconnected access points

Question 26

(LTE

Answer 26

Long-Term Evolution (LTE) - A newer and faster technology considered to be part of 4G technology.

Question 27

One-way multicast

Answer 27

one-way satellite-based Internet services can be used to push pages to local storage at end-user sites.

Question 28

One-way terrestrial return

Answer 28

One-way terrestrial return - Satellite Internet systems use traditional dialup access to send outbound data through a modem and receive downloads from the satellite.

Question 29

Two-way satellite Internet -

Answer 29

Two-way satellite Internet - Sends data from remote sites via satellite to a hub, which then sends the data to the Internet. The satellite dish at each location needs precise positioning to avoid interference with other satellites.

Question 30

(VSAT

Answer 30

Very Small Aperture Terminals (VSAT): A VSAT is a type of satellite dish similar to the ones used for satellite TV from the home and is usually about 1 meter in width. The VSAT dish sits outside, pointed at a specific satellite, and is cabled to a special router interface, with the router inside the building. Using VSATs creates a private WAN.

Question 31

(PPPoE

Answer 31

PPP over Ethernet : allows the sending of PPP frames encapsulated inside Ethernet frames. *DSL does not support PPP so this way PPP point to point can be used by encapsulating PPP inside ethernet frames.