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Network+ > WAN > Flashcards

WAN Flashcards

1
Q

Dedicated Leased Line

A

▪ Logical connection that connects two sites through a service provider’s facility or telephone company’s central office
▪ More expensive than other WAN technologies because a customer doesn’t share bandwidth with other customers

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2
Q

Circut-Switched Conncetion

A

▪ Connection is brought up only when needed, like making a phone call
▪ On-demand bandwidth can provide cost savings for customers who only need periodic connectivity to a remote site

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3
Q

Packet-Switched Connection

A

▪ Always on like a dedicated leased line, but multiple customers share the bandwidth
▪SLAs used to guarantee a certain quality (5mbps at least 80% of the time) Virtual circuits are represented as dashed lines

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4
Q

RG-6

A

Coaxial cable

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5
Q

BPL

A

Broadband over Power Line

2.7 Mbps

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6
Q

HSPA+

A

Evolved High-Speed Packet Access
Wireless broadband
84 Mbps
Advancement over LTE and 4G

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7
Q

WiMax

A

Worldwide Interoperability for MIcrowave Access

Alternateive to DLS/Cell
Wireless fixed location service

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8
Q

DS0

A

Digital Signal 0
64 kbps channels
can be combined

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9
Q

T1

A

24 Channels

~1.5 Mbps

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10
Q

T3

A

672 Channels

~45 Mbps

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11
Q

E1

A

2.0 Mbps

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12
Q

Metro Ethernet

A

▪ Service providers are beginning to offer Ethernet interfaces to their customers
▪ Less expensive and more common than specialized serial ports used in a CSU/DSU
▪ Technology used by service provider is hidden from customer and they only need to connect their network’s router to a Smart Jack

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13
Q

PPP

A

Point-to-Point Protocol (PPP)

▪ Commonly used Layer 2 protocol on dedicated leased lines to simultaneously transmits multiple Layer 3 protocols (IP, IPX)

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14
Q

PAP

A

Password Authentication Protocol

PPP Authentication
▪ Performs one-way authentication between client and server
▪ Credentials sent in clear-text

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15
Q

CHAP

A

Challenge Handshake Authentication Protocol
CHAP

● Challenge-Handshake Authentication Protocol

● Performs one-way authentication using a three-way handshake

● Credentials are hashed before transmission

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16
Q

PPPoE

A

PPP over Ethernet (PPPoE)

▪ Commonly used with DSL modems
▪ PPPoE encapsulates PPP frames within Ethernet frames ▪ Allows for authentication over Ethernet

17
Q

DSL

A

Digital Subscriber Line

18
Q

ADSL

A

Asymmetric DSL (ADSL)

● Maximum distance to DSLAM: 18,000 feet

● Voice and Data on same line

● Downstream: Up to 8 Mbps

● Upstream: Up to 1.544 Mbps

19
Q

SDSL

A

Symmetric DSL (SDSL)

● Maximum distance to DSLAM: 12,000 feet

● No simultaneous voice and data on same line

● Downstream: 1.168 Mbps

● Upstream: 1.168 Mbps

20
Q

VDSL

A

Very High Bit-Rate DSL (VDSL)

● Maximum distance to DSLAM: 4,000 feet

● Downstream: Up to 52 Mbps

● Upstream: Up to 12 Mbps

21
Q

HFC

A

Hybrid Fiber-Coax

Cable Modem
distribution network is a cable television infrastructure containing both coaxial and fiber-optic cabling

22
Q

DOCSIS

A

Data-Over-Cable Service Interface Specifications

Cable Modem

23
Q

POTS

A

Plain Old Telephone Service

Public switched telephone network (PSTN) consists of telephone carriers from around the world

24
Q

PSTN

A

Public Switched Telephone Network

Public switched telephone network (PSTN) consists of telephone carriers from around the world

25
Q

ISDN

A

Integrated Services Digital Network (ISDN)

▪ Supports multiple 64-kbps B (Bearer) channels
▪ Older technology designed to carry voice, video, or data over B channels
▪ D channel (data or delta channel) existed for 64-kbps signaling data
▪ Circuits classified as a basic rate interface (BRI) or primary rate interface (PRI):
● BRI: Offers a two 64-kbps B-channels with a 16kbps D-channel

 ● PRI: Offers a 1.472-Mbps data path over 23 B-channels and a 64kbps D-channel
26
Q

Frame Relay

A

Losing market share due to cable and DSL

● Frame Relay sites connected to virtual circuits (VC)

● VCs are point-to-point or point-to-multipoint

● Low cost and widely available

● Always-on or on-demand

● Layer 2 technology Synchronous Optical Network (SONET)

27
Q

SONET

A

Synchronous Optical Network (SONET)
▪ Layer 1 technology using fiber as media
▪ Transports Layer 2 encapsulation (like ATM)
▪ High data rates (155 Mbps to 10 Gbps)
▪ Covers large distances (20 km to 250 km)
▪ Physical topology can be a bus or ring

28
Q

ATM

A 
Asynchronous Transfer Mode
FIBER AND SONET
Rides on top of SONET
Uses fixed-length CELLS as its PDU
53 Bite cell so makes it faster to move around
29
Q

MPLS

A

Multiprotocol Label Switching

Used by service providers
Supports multiple protocols on same network
Can use both ATM and Frame Relay

30
Q

DMVPN

A

Dynamic Multipoint Virtual Private Network

▪ Allow Internet to be used as WAN connection for secure site-to-site communication
▪ VPN tunnel has authentication and encryption so users on the unsecure network cannot read or decrypt the traffic without proper keys
▪ Can connect remote locations with low cost, instead of dedicated or leased-line access

31
Q

OC

A

Optical Carrier

OC-1 ~51 Mbps
rest are multiples

OC-3~155 Mbps

How ATM and SONET measure data rates ATM and SONET

Network+ (11 decks)

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