Wide Area Networks Flashcards
1
Q
Enterprise WAN
A
WAN controlled single organization
- rarely is all infrastructure owned by org
- Large orgs usually use public internet
2
Q
Modem
A
- Performs modulation of outgoing signals and demodulation of incoming data
- Modern modems transform ehternet frames for transmission over WAN media
- Only on layer 1
- Include DSUs for Leased lines, Digital Subscriber lines, cable modems and satelite modems.
3
Q
Demarcation Point
A
- Point at which providers network terminates on a premises.
- End of telco’s responsibility to maintain equipment
4
Q
T1 Digital Signal Circuit
A
- Leased line service
- 24 channels multiplexed into single 1.5 Mbp full-duplex connection for voice or data.
- Terminates in smartjack or NIU which connects to Channel Service Unit/Data Service Unit.
5
Q
DSL
A
Digital Subscriber Line
- Used to transfer data over voice-grade telephone lines (Local Loop)
6
Q
DSL Modem
A
CPE
- Connected with RJ-11 to phone line and RJ45 to local router
- Suffers from attenuation
- Max DSL modem range is 3 miles
7
Q
Symmetrical DSL
A
- Provides same uplink and downlink bandwidth
- Tends to provided as business package rather than residential
8
Q
Asymmetrical DSL
A
- Consumer version with fast downlink, slow uplink
- Latest version offers 24 Mbps down, 3.3 down
9
Q
FTTx
A
Fiber to the X
- Trying to get fiber to a specific point, like demarc
- Fiber to home or premises is most expensive
- Fiber to Node or Curb still utilize some copper to get to demarc
10
Q
Cable Internet
A
- Usually available along side Cable Access TV
- Combine Fiber core network with coax to CPE
- Referred to as cable broad band
- Typically 38 Mbps up, 27 down
11
Q
Carrier Ethernet
A
- Provisions point to point ethernet leased lines over WAN
- Can be called Metro-Optical provider link
- Easily scalable
- Can make configurations of appliances easier
12
Q
E-Line
A
- Establishes point to point link between two sites
- Multiple E-lines can be configured into single Metro Ethernet with each line representing a separate VLAN
13
Q
E-LAN
A
Establishes a mesh topology between multiple sites
14
Q
PON
A
Passive Optical Network
- Full fiber connections for residential and small businesses
- Limited to a few metro areas
- Offer tiers of 100mbps to 1gb
- Single fiber runs to nearest exchange on street
- Spliters direct each subscribers frequency over fiber to ONT or ONU (Optical network unit/terminal) in demarc
- Patches into customer router
15
Q
Satellite
A
- Covers far larger area where DSL and cable are unlikely
- Can have severe latency issues
- Big problem for real-time applications
- Satellite dish is installed and connected with coax to Digital Video Broadcast Satellite modem
