CCNA exam results is dependent mainly on noticing the details, which is very true of 먹튀검증 configurations involving http://www.bbc.co.uk/search?q=먹튀검증 specifically connected serial interfaces. And of course, it’s not adequate to note these information – you’ve obtained to grasp how to proceed about them!
A Cisco router can be a DTE by default, but specifically connecting two DTEs using a DCE/DTE cable will not be ample. In the following case in point, R1 and R3 are directly related at their Serial1 interfaces. The road goes up briefly soon after being opened, but the line protocol goes down after about thirty seconds.
R3(config-if)#int s1
R3(config-if)#ip handle 172.12.13.three 255.255.255.0
R3(config-if)#no shutdown
2d18h: %Backlink-3-UPDOWN: Interface Serial1, modified condition to up
2d18h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed point out to up
R3(config-if)#
2d18h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, transformed state to down
The condition is the fact that one of the routers needs to act as the DCE to ensure that the road protocol to come back up and stay up. If this ended up your CCNA / CCNP house lab, you could potentially just go in excess of and think about the DTE/DCE cable to see which router had the DCE conclusion from the cable attached. In this instance, however, we don’t have Bodily entry to the routers. How can we convey to which router has the DCE finish of your cable attached?
R3#display controller serial 1
High definition device one, idb = 0x1C44E8, driver structure at 0x1CBAC8
buffer sizing 1524 High definition device 1, V.35 DCE cable
The show controller command provides us this details. (There’s lots far more output that this with this particular command, nonetheless it’s unimportant for our applications.) The router With all the DCE conclude in the cable requires to supply a clock fee to the DTE, and we’ll do just that Together with the interface-degree clockrate command.
R3#conf t
Enter configuration instructions, 1 for every line. End with CNTL/Z.
R3(config)#int serial1
R3(config-if)#clockrate 56000
In just a couple seconds, the road protocol goes up and stays up.
When troubleshooting a connection, often operate display interface initially. If the thing is the combination proven down below, the relationship is bodily high-quality but logically down. That’s normally the results of a necessary keepalive not being present. With Frame Relay, it’s possibly an LMI challenge, but with instantly connected serial interfaces The problem is probably the DCE close of the link not providing clockrate.
R3#clearly show interface serial 1
Serial1 is up, line protocol is down
Troubleshooting is a large A part of The work, and it’s an enormous A part of the Cisco CCNA and CCNP systems too. Know your display and debug commands therefore you’re with your solution to passing the CCNA!