ExamTopics Logo
Mail Us[email protected]
Menu
Cisco Discussions
exam questions

Exam 350-801 All Questions

View all questions & answers for the 350-801 exam
Go to Exam

Exam 350-801 topic 1 question 309 discussion

Actual exam question from Cisco's 350-801
Question #: 309
Topic #: 1
[All 350-801 Questions]


Refer to the exhibit. An engineer configures ISDN on a voice gateway. The provider confirms that the PRI is configured with 10 channels the engineer ordered and is working from the provider side, but the engineer cannot get a B-channel to carry voice. The rest of the configuration for the serial interface and voice network is functioning correctly. Which actions must be taken to carry voice?

  • A. The engineer must activate the controller card on the voice gateway before configuring the device.
  • B. The engineer used a T1 interface but must use an E1 interface.
  • C. The pri-group timeslots command must be 0-9 for the 10 channels because all values on a router start with 0.
  • D. The engineer must manually revert the order of using the channels.
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by Testme1235 at Feb. 25, 2023, 1:31 a.m.

Comments

Chosen Answer:
This is a voting comment (?). It is better to Upvote an existing comment if you don't have anything to add.
Switch to a voting comment New
Submit Cancel
JC2008
Highly Voted 1 year, 9 months ago
D: is very likely the correct answer. A - is not correct, one cannot enter controller T1 interface if the Controller Card is not activated. B - is very unlikely. There is no indication of T1 vs E1, which normally only use outside of USA. C - is incorrect, the pri-group timeslot 1-10 cannot be 0-9 as "0" is not a valid number on Cisco IOS. D - since this is only fractional T1 circuit 1-10, by default IOS outbound calls are in descending order. All outbound calls will go out from bottom up(B-channel 23 and up) unless you manually configure the isdn busy b-channel XX to direct the IOS router not to sending calls out as a full T1 circuit. Therefore by manually revert the order of using the channels will work in this case. Understanding doing so may create glare but this is beside the point for this question.
upvoted 9 times
sneff91
9 months, 1 week ago
Answer is indeed D. Cisco IOS default is a descending channel order for outbound calls: https://www.cisco.com/c/en/us/td/docs/ios/dial/configuration/guide/15-mt/dia_15_mt_book/dia_cfg_isdn_pri.html "Verify if the outgoing B channel calls are made in ascending or descending order. Cisco IOS default is descending order however, if the switch from the service providers is configured for outgoing calls made in ascending order, the router can be configured to match the switch configuration of the service provider."
upvoted 2 times
...
MeowthL
1 year, 9 months ago
i'm agreed with you, the answer is D https://www.cisco.com/en/US/docs/ios/dial/configuration/guide/dia_cfg_isdn_pri_external_docbase_0900e4b1806c752c_4container_external_docbase_0900e4b18216dd1b.html
upvoted 1 times
...
...
decdca7
Most Recent 3 weeks, 6 days ago
Selected Answer: D
There is no mention of the service to be E1 Then only option is D
upvoted 1 times
...
Komy
7 months, 1 week ago
Selected Answer: D
Answer is D
upvoted 2 times
...
Testme1235
1 year, 9 months ago
Selected Answer: B
Option A, "The engineer must activate the controller card on the voice gateway before configuring the device," is not a valid solution to this issue because the controller card is already configured and functional since the voice network and serial interface are working correctly. The issue is related to the incorrect interface type being used, which is causing the B-channel to fail to carry voice. Therefore, activating the controller card will not resolve this particular issue.
upvoted 2 times
WeNt48
1 year, 9 months ago
Where in the text you have information it should be E1? linecode is correct for T1, so there is not information to think it could be B. C sounds same bad as B. With the information provided honestly I've no clue to pick up correct answer. There is no information that channels should be used ascending or descending, and from my real life experience that would be my first guess to check out - but does this correct answer? Not sure.
upvoted 1 times
...
m4tt30000
1 year, 9 months ago
Are u kiddin us? how you activate the card after configuring the controller? this is reversed
upvoted 2 times
...
0n3
11 months, 2 weeks ago
B is correct. The shown configuration is the usual/default configuration for a E1, but the used card type is a T1. https://www.cisco.com/c/dam/en/us/td/docs/routers/ncs4200/configuration/guide/tdm/tdm-cfg-t1-e1-ncs4200-book.html Check the "Configuring the Controller" section.
upvoted 1 times
sneff91
9 months, 1 week ago
Not true. Per the article you linked yourself: "b8zs—Specifies binary 8-zero substitution (B8ZS) as the linecode type. Valid for T1 controller only. This is the default for T1 lines." The linecode here is using b8zs, which isn't supported on an E1. There's also nothing here to suggest that an E1 is the provided service. E1s also don't support ESF. In that article, it has a typo and says: sf—Specifies Super Frame as the T1 frame type. esf—Specifies Extended Super Frame as the T1 frame type. This is the default for E1. crc4—Specifies CRC4 as the E1 frame type. This is the default for E1. no-crc4—Specifies no CRC4 as the E1 frame type. Obviously esf and crc4 cannot both be the default for E1. It should mean to say that ESF is the default for T1.
upvoted 1 times
...
...
...
Community vote distribution
A (35%)
C (25%)
B (20%)
Other
Most Voted
A voting comment increases the vote count for the chosen answer by one.

Upvoting a comment with a selected answer will also increase the vote count towards that answer by one. So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.

SaveCancel
exam
Someone Bought Contributor Access for:
SY0-701
London, 1 minute ago