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Cisco Certs > WAN > Flashcards

WAN Flashcards

1
Q

What does DCE stand for?

A

Data Communication Equipment

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2
Q

What does HDLC stand for?

A

High-level Data Link Control

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3
Q

What is a DCE cable used to connect?

A

With a DTE cable, used to connect two router serial ports back to back

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4
Q

In Frame Relay, what does LMI stand for?

A

Local Management Interface

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5
Q

What does DLCI stand for?

A

Data Link Connection Identifier

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6
Q

What encapsulation is set on a serial interface that will connect to a frame relay network?

A

frame-relay

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7
Q

Syntax to set a serial interface to frame relay encapsulation

A

conf t
int s1/0
encapsulation frame-relay

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8
Q

2 options for encapsulation frame-relay

A
  1. cisco

2. ietf

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9
Q

When leaving off the specific encapsulation type for the command “encapsulation frame-relay”, what is the default?

A

cisco

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10
Q

Syntax of the frame-relay map command

A

frame-relay map ip ip address dlci [broadcast]

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11
Q

Syntax to bind a dlci to an interface

A

frame-relay interface-dlci dlci

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12
Q

Command to show InArp data

A

show frame-relay map

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13
Q

What does PPP stand for?

A

Point to Point Protocol

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14
Q

What are 2 PPP control protocols?

A

LCP

NCP

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15
Q

What do NCP and LCP stand for?

A

Network Control Protocols

Link Control Protocol

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16
Q

What’s a glaring difference between NCP and LCP?

A

LCP is a single protocol, whereas NCP is a suite of protocols that are each specific to a Layer 3 protocol.

17
Q

4 features of PPP LCP

A
  1. Loop detection
  2. Error detection
  3. Multilink support
  4. Authentication
18
Q

What 2 types of authentication are supported by PPP?

A

PAP

CHAP

19
Q

What do PAP and CHAP stand for?

A

Password Authentication Protocol

Challenge Handshake Authentication Protocol

20
Q

Which PPP auth protocol sends a password in clear text?

A

PAP

21
Q

What are the 3 steps of a successful CHAP authenticatoin?

A
  1. Authenticator sends challenge packet.
  2. Caller hashes password etc and sends back hashed value.
  3. Authenticator compares submitted value to their own hashed value, and if they match it allows the caller in.
22
Q

Command to set PPP on a serial interface

A

conf t
int s1/0
encapsulation ppp

23
Q

2 general steps to have a PPP link use PAP or CHAP

A
  1. Configure the username/password for the calling router.

2. Set the serial link to use PPP PAP

24
Q

What will the state of a serial link be if PPP authentication fails?

A

Up/down

25
Q

Syntax to set a username/pass for use in PPP authentication

A

username caller hostname password password

26
Q

Syntax to have a serial interface use CHAP

A

conf t
int s1/0
ppp authentication chap

27
Q

2 useful debug commands for PPP

A

debug ppp authentication

debug ppp negotiation

28
Q

What are the 2 primary attributes of a leased line?

A

Symmetrical speeds

Always on

29
Q

What kind of cable goes between a router and a CSU?

A

DTE

30
Q

What are the 5 fields in the HDLC header?

A
  1. Flag
  2. Address
  3. Control
  4. Type
  5. FCS
31
Q

What field did Cisco add to their implementation of HDLC?

A

Type

32
Q

What does the Cisco HDLC Type field help with?

A

It identifies which L3 protocol is contained in the packet.

33
Q

What is the default encapsulation on a Cisco router’s serial interface?

A

Cisco HDLC

34
Q

Command to set a serial interface to use HDLC

A

conf t
int s1/0
encapsulation hdlc

35
Q

Command to verify if a serial interface is set up as a DTE or DCE

A

show controllers serial int number

36
Q

Command to check encapsulation type on a serial interface

A

show interface serial int number

37
Q

What types of WAN connections support asynchronous connections?

A

Serial line with PPP

38
Q

How do the fields in a PPP header differ from that of HDLC?

A

They don’t.

39
Q

What would lead to an up/down state on a serial interface?

A
  1. Encapsulation mismatch
  2. One side having keepalives disabled
  3. Authentication failure/mismatch

Cisco Certs (14 decks)

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