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d600_ISDN Questions

CCNA_ISDN Questions

QuestionAnswer
What command allows you to view CHAP and PAP authentication taking place? Debug ppp negotiation
If two Cisco routers are directly connected via Serial interfaces, what must the DCE router do? The router acting as the DCE must supply a clock rate.
What command indicates what traffic is considered “interesting traffic”? Dialer-list
What command is used on the BRI interface to link the dialer-list to the interface? Dialer-group
What command displays whether the cable connected to a Serial interface is the DTE end or DCE end? Show controller
What command displays the source and destination of traffic that brought up an ISDN line? Show dialer
What is the default encapsulation type for a Serial point-to-point link? HDLC.
What interface-level command will change the default encapsulation type on a Serial point-to-point link to PPP? Encapsulation ppp
What PPP authentication scheme sends the password over the wire in clear-text?` PAP sends passwords in clear-text.
What does PAP stand for? Password Authentication Protocol.
Can the passwords sent by the two hosts in a PAP authentication scheme be different? With PAP, the passwords can be different. With CHAP, they cannot.
How does CHAP handle sending the password? CHAP runs a hash algorithm using the password and a random number. This hash result is sent.
Can the passwords sent by the two hosts in a CHAP authentication scheme be different? No. Since the hash result must match on both sides, the passwords used in running the hash must be the same.
What is the primary purpose of a B-channel in ISDN? B-channels carry data.
What is the primary purpose of a D-channel in ISDN? D-channels set up and tear down the call.
How many B-channels and D-channels are there in an ISDN BRI? Two B-channels and one D-channel.
What is the capacity of a D-channel in an ISDN BRI? 16 kbps.
In a United States PRI, how many B-channels and D-channels are there? There are 23 B-channels and one D-channel.
What is the capacity of a D-channel in a United States PRI? 64 kbps.
What ISDN command verifies that the switch-type has been defined and the SPIDs are valid? Show isdn status
What is the term for the packets that will cause a router to dial another router and bring up the ISDN link? Interesting traffic.
By default, once the ISDN link is up, what traffic can go across it? Any traffic, not just interesting traffic
What value determines when the ISDN link goes down? The idle-timer.
What kind of traffic resets the ISDN idle-timer? Interesting traffic not only brings the ISDN link up, it also resets the ISDN idle-timer.
What is the default value for the ISDN idle-timer? 120 seconds.
What command does a dialer profile use to indicate the number to dial to reach the remote router? Dialer string
What command will tell you if there’s an active call on your ISDN link? Show isdn status
What command will show you all calls placed on a router over the last 15 minutes? Show isdn history
By default, will broadcasts go out over an ISDN link? No. The “broadcast” keyword must be used in the dialer map statement for this to happen.
What two interface-level commands would be necessary to enable PPP PAP authentication on an ISDN interface? Encapsulation ppp Ppp authentication pap
What command is needed for a PAP authentication scheme that is never used in CHAP? Ppp pap sent-username must be used in a PAP authentication scheme.
PPP is running on your ISDN routers. What two commands will bring the second B-channel up when the first B-channel reaches 50% of capacity? Ppp multilink
True or False: When configuring the clockrate command for directly connected Serial interfaces, the command always goes on the DTE. False. The clockrate is always configured on the DCE.
True or False: Configuring CHAP allows you to use different passwords for each router in the ISDN connection. False. PAP allows you to use different passwords; CHAP requires use of the same password.
Describe what CHAP does with a password during the authentication process. The CHAP password is hashed, along with a random number. It is this hash result that is sent to the remote router.
Put these three values in order, lowest to highest. The number of Bchannels in a PRI(US); the number of B-channels in a BRI; the number of B-channels in a PRI (Europe). The number of B-channels in a BRI: 2 The number of B-channels in a PRI (US): 23 The number of B-channels in a PRI (Europe): 30
When using “show interface bri0” on your ISDN router, you notice the interface shows as “administratively down”. What will resolve this issue? “administratively down” means someone shut the interface down. Reopen it with “no shutdown” on the interface level.
Created by: papid69
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