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CompTIA N10-007 Network+ > WAN Technologies > Flashcards

Flashcards in WAN Technologies Deck (8)
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1
Q

MPLS

A
  • Learning from ATM and Frame Relay
    • Packets through the WAN have a label
    • Routing decisions are easy
  • Any transport medium, any protocol inside
    • IP packets, ATM cells, Ethernet frames
    • OSI layer 2.5 (!)
  • Increasingly common WAN technology
    • Ready-to-network
2
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
3
Q

ATM

A
  • Asynchronous Transfer Mode
    • A common protocol transported over SONET
  • 53-byte “cells” spaced evenly apart
    • 48-byte for data, 5-byte routing header
  • High throughput, real-time, low latency
    • Data, voice, and video
  • Max speeds of OC-192
    • Limits based on segmentation and reassembly (SAR)
4
Q

Frame relay

A
  • One of the first cost-effective WAN types
    • Departure from circuit-switched T1s

• LAN traffic is encapsulated into frame relay frames

  • Frames are passed into the “cloud”
    • Magically appear out the other side

• Usually 64 Kbits/s through DS3 speeds

  • Effectively replaced by MPLS
    • And other WAN technologies
5
Q

PPP (Point-to-point protocol)

A
  • Create a network connection between two devices
    • OSI layer 2 / data link protocol
    • Communicate using many different protocols

• Works almost anywhere
• Dial-up connections, serial links, mobile phone, DSL
(PPPoE)

  • Provides additional data link functionality
    • Authentication
    • Compression
    • Error detection
    • Multilink
6
Q

PPPoE

A
  • Encapsulate point-to-point protocol over Ethernet
    • The past with the present
  • Common on DSL networks
    • Telephone providers know PPP
  • Easy to implement
    • Support in most operating systems
    • No routing required
    • Similar to existing dialup architecture

• Allows competition
• Once connected, data is switched to the appropriate
ISP

7
Q

DMVPN

A
  • Dynamic Multipoint VPN
    • Common on Cisco routers
  • Your VPN builds itself
    • Remote sites communicate to each other
  • Tunnels are built dynamically, on-demand
    • A dynamic mesh
8
Q

SIP trunking

A
  • Session Initiation Protocol
    • Control protocol for VoIP
  • Traditional PBX connectivity uses T1/ISDN
    • 23 voice channels, 1 signaling channel
    • When the lines are full, you get a busy signal
  • SIP trunking
    • Use SIP/VoIP to communicate to an IP-PBX provider
  • More efficient use of bandwidth
    • Less expensive than ISDN lines
    • More phone system options

Decks in CompTIA N10-007 Network+ Class (86):