Exam 350-801 topic 1 question 309 discussion

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."

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

In fact, it does not matter the order of consumption, it does not define if a b channel exists or not. B,, believe ir or not, is the correct answer. VWIC1/2/3 all of them support E1/T1. If the carrier has a E1configured and the customer has a T1 configured, is enough reason to do not have b-channels, but yo can have d-channel because d-channel is into Layer 2. Commonly, you must ensure that the framing, line coding, and clock source are configured correctly. And the way that you could have this issue, this is one, that customer configured card type t1 meanwhile in the other side have e1, then you will have problem with framing and line code. So, change card type from t1 to e1, and configure a E1 with the correct framing and linecode. B, is correct. https://www.cisco.com/c/en/us/support/docs/wan/t1-e1-t3-e3/8131-T1-pri.html https://www.cisco.com/c/en/us/support/docs/wan/t1-e1-t3-e3/10205-t1-flchrt-main.html

Yo are right, if the remote side configured E1 and the local side configured T1, it will have problems with linecode and framing, then you will have d-channel and no b-channels. The customer told to carrier to configure 10 channels, but not which of the 23 ones, or 31 ones, because E1 or T1 was no said to the carrier too. I the carrier set E1 and customer T1, you will have problems with framing and linecode and you will not have any b channel. If customer put 1-10 and the carrier put 11-20, answer D. will not solve the problem. Whether it be one or the another one case, you will have to reconfigure the Controller.

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.

Are u kiddin us? how you activate the card after configuring the controller? this is reversed

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.