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Comptia network + > 2.5 Compare and contrast WAN technologies. > Flashcards

2.5 Compare and contrast WAN technologies. Flashcards

1
Q

ISDN - Integrated Services Digital Network

A

• BRI – Basic Rate Interface (2B+D)• Two 64 kbit/s bearer (B) channels

  • One 16 kbit/s signaling (D) channel
  • Delivered over a T1 or E1
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2
Q

T1 / E1

A
  • T-Carrier Level 1
  • Time-division multiplexing
  • 24 channels - 64 kbit/s per channel
  • 1.544 Mbit/s line rate
  • E-Carrier Level 1
  • E is for Europe
  • 32 channels - 64 kbit/s per channel • 2.048 Mbit/s line rate
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3
Q

T3 / DS3 / E3

A
  • T-Carrier Level 3
  • Delivered on coax (BNC connectors)
  • DS3 is the data carried on a T3
  • Twenty-eight T1 circuits - 44.736 Mbit/s
  • E3 • Sixteen E1 circuits - 34.368 Mbit/s
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4
Q

OC (Optical Carrier)

A
  • SONET (Synchronous Optical Networking)

* Commonly implemented by carriers on SONET rings

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5
Q

OC-3

A

155.52 Mbit/sec

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6
Q

OC-12

A

622.08 Mbit/sec

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7
Q

OC-48

A

2.49 Gbit/sec

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8
Q

OC-192

A

9.95 Gbit/sec

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9
Q

DSL

A
  • ADSL (Asymmetric Digital Subscriber Line)
  • Uses telephone lines
  • Download speed is faster than the upload speed
  • ~10,000 foot limitation from the central office (CO)
  • 52 Mbit/s downstream / 16 Mbit/s upstream are
  • Faster speeds may be possible if closer to the CO
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10
Q

Metro Ethernet

A
  • Metropolitan-area network
  • A contained regional area
  • The Ethernet is usually running over a different topology
  • Pure Ethernet
  • Ethernet over SDH, MPLS, or DWDM
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11
Q

Cable broadband

A
  • Transmission across multiple frequencies
  • Data on the “cable” network
  • High-speed networking
  • Multiple services - Data, voice
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12
Q

Dialup

A
  • Network with voice telephone lines
  • 56 kbit/s modems - Compression up to 320 kbit/s
  • Relatively slow throughput - Difficult to scale
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13
Q

Satellite networking

A
  • Communication to a satellite
  • High cost relative to terrestrial networking
  • High latency - 250 ms up, 250 ms down
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14
Q

Copper

A
  • Extensive installations
  • Limited bandwidth availability
  • Wide area networks
  • Often combined with fiber
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15
Q

Fiber

A
  • High speed data communication - Frequencies of light
  • Higher installation cost than copper
  • Large installation in the WAN core
  • SONET, wavelength division multiplexing
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16
Q

• SONET, wavelength division multiplexing

A
  • Use the cellular network - Wireless WAN
  • Intermittent communication
  • Roaming communication
  • Limited by coverage and speed
17
Q

MPLS

A
  • Learning from ATM and Frame Relay
  • Packets through the WAN have a label
  • Any transport medium, any protocol inside
  • IP packets, ATM cells, Ethernet frames
18
Q

MPLS pushing and popping

A
  • Labels are “pushed” onto packets as they enter the MPLS cloud
  • Labels are “popped” off on the way out
19
Q

ATM

A
  • Asynchronous Transfer Mode
  • High throughput, real-time, low latency
  • 53-byte “cells” spaced evenly apart
20
Q

Frame relay

A
  • One of the first cost-effective WAN types
  • LAN traffic is encapsulated into frame relay frames
  • Frames are passed into the “cloud”
  • Effectively replaced by MPLS
21
Q

PPP (Point-to-point protocol)

A
  • Create a network connection between two devices

* Works almost anywhere

22
Q

• Provides additional data link functionality

A

• Authentication
Compression
• Error detection
Multilink

23
Q

PPPoE

A
  • Encapsulate point-to-point protocol over Ethernet
  • Common on DSL networks• Easy to implement
  • Allows competition
24
Q

DMVPN

A
  • Dynamic Multipoint VPN
  • Your VPN builds itself
  • Tunnels are built dynamically, on-demand
25
Q

SIP trunking

A
  • Session Initiation Protocol
  • Traditional PBX connectivity uses T1/ISDN
  • Use SIP/VoIP to communicate to an IP-PBX provider
  • More efficient use of bandwidth
26
Q

Demarcation point

A

• The point where you connect with the outside world

27
Q

CSU/DSU - Channel Service Unit / Data Service Unit

A
  • CSU - Connects to the network provider
  • DSU - Connects to the data terminal equipment (DTE)
  • Physical device - Or built-in to the router
28
Q

CSU/DSU connectivity

A
  • From the demarc
  • RJ-48c wiring
  • To the router
  • Serial connection, v.35, RS-232• May also include monitor jacks
29
Q

Smartjack

A
  • Network interface unit (NIU)
  • The device that determines the demarc
  • More than just a simple interface
  • Built-in diagnostics
  • Alarm indicators

Comptia network + (26 decks)

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