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Cisco CCNA ICND2 > WAN Technologies > Flashcards

WAN Technologies Flashcards

1
Q

What speed is a T1 line

A

1.544 mbps

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2
Q

What speed is an E1 line

A

2.048 mbps

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3
Q

What are the two WAN encapsulation methods

A

HLDC and PPP

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4
Q

What are the features of HLDC

A
  • no features other connectivity
  • nothing to unpack
  • proprietary and default encapsulation method
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5
Q

What are the features of PPP

A
  • Industry standard
  • Can connect non cisco devices
  • Lots of features e.g compression, multilink, callback, authentication
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6
Q

What are the 3 layers of PPP

A

NCP (network control protocol) - responsible for L3 protocols

LCP link control protocol - negotiates features

HLDC

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7
Q

What authentication does PPP use

A

PAP or CHAP (more secure, uses hashing)

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8
Q

What are the 4 realms of PPP

A

Multilink
Callback
Authentication
Compression

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9
Q

What does the debug ppp authentication command allow

A

To watch PPP autentication as it happens

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10
Q

What is multilink

A

Allows the bundling of serial interfaces to double BW

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11
Q

What are the differences between Leased lines and packet switched networks

A

Leased lines:
Inflexible
unsued BW
Expensive

Packet switched:
Virtual circuits
Each packet is destinationed
Cheaper

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12
Q

What are the types of switched networks

A

x.25
frame relay
ATM
MPLS

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13
Q

How does MPLS work

A

Allows to put tags on the connection

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14
Q

How does PPPoE work

A

PPP over ethernet

Using a dialer interface

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15
Q

How is PPPoE configured

A 
interface Dialer1
R1(config-if)# ip address negotiated
R1(config-if)# encapsulation ppp
R1(config-if)# dialer pool 1
R1(config-if)# end

R1(config)# interface Ethernet0/1
R1(config-if)# no ip address
R1(config-if)# pppoe-client dial-pool-number 1

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16
Q

What are the VPN objectives

A
  • Confidentiality – stop prying eyes
  • Authentication – validate the identity
  • Data integrity – preventing change (hashing)
  • Anti replay – eliminate déjà vu
17
Q

What are the types of VPN you can have

A
  • Site to site
  • Client (remote access – ipsec)
  • SSLVPN (https)
  • DMVPN (dynamic multipoint)
18
Q

What is a GRE tunnel

A

Encapsulation tunnelling protocol

Allows routing info to pass between connected networks

19
Q

What is a DMVPN

A

Dynamic multipoint VPN

Makes it easier to configure several vpns

A little more automated and easier to manage

20
Q

How is a GRE tunnel configured

A
  • Interface tunnel #
  • Ip address
  • Tunnel mode gre ip (tunnel mode gre multipoint is for dmvpn)
  • Tunnel source
  • Tunnel destination
21
Q

What port does BGP use

A

TCP 179

22
Q

How is BGP configured

A

• Router bgp 5000
• Neighbour 200.1.1.2 remote-as 2500
• Network 63.1.5.0 mask 255.255.255.0
*Network command takes a route from internal routing table and advertises to outside world *

Cisco CCNA ICND2 (5 decks)

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