Cisco Passguide 200-120 Exam Questions & Answers

Number: 200-120Passing Score: 825Time Limit: 500 minFile Version: 15.8

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Cisco 200-120 Exam Questions & Answers

Exam Name: CCNA Cisco Certified Network Associate CCNA (803)

Last Update: Sep 28, 2013

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QUESTION 2

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Explanation/Reference:To remember which type of cable you should use, follow these tips:- To connect two serial interfaces of 2 routers we use serial cable To specify when we use crossover cableor straight-through cable, we should remember:Group 1: Router, Host, Server Group 2: Hub, SwitchOnedevice in group 1 + One device in group 2: use straight-through cable Two devices in the same group: usecrossover cableFor example: we use straight-through cable to connect switch to router, switch to host, hub to host, hub toserver... and we use crossover cable to connect switch to switch, switch to hub, router to router, host tohost... )

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Explanation/Reference:If we have many entries matching for next hop ip address then the router will choose the one with mostspecific path to send the packet. This is called the "longest match" rule, the route with the most bits in themask set to "1 will be chosen to route packet.

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Explanation/Reference:A simple way to find out which layer is having problem is to remember this rule: "the first statement is forLayer 1, the last statement is for Layer 2 and if Layer 1 is down then surely Layer 2 will be down too", soyou have to check Layer 1 before checking Layer 2. For example, from the output "Serial0/1 is up, lineprotocol is down" we know that it is a layer 2 problem because the first statement (Serial0/1 is up) is goodwhile the last statement (line protocol is down) is bad. For the statement "Serial0/1 is down, line protocol isdown", both layers are down so the problem belongs to Layer 1.There is only one special case with the statement ".... is administrator down, line protocol is down". In thiscase, we know that the port is currently disabled and shut down by the administrators.

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Explanation/Reference:The question asks us to "begin with the lowest layer" so we have to begin with Layer 1: verify physicalconnection; in this case an Ethernet cable connection. For your information, "verify Ethernet cableconnection" means that we check if the type of connection (crossover, straight- through, rollover...) iscorrect, the RJ45 headers are plugged in, the signal on the cable is acceptable...Next we "verify NIC operation". We do this by simply making a ping to the loopback interface 127.0.0.1. If itworks then the NIC card (layer 1, 2) and TCP/IP stack (layer 3) are working properly.Verify IP configuration belongs to layer 3. For example, checking if the IP can be assignable for host, thePC's IP is in the same network with the gateway... Verifying the URL by typing in your browser somepopular websites like google.com, microsoft.com to assure that the far end server is not down (itsometimes make we think we can't access to the Internet). We are using a URL so this step belongs tolayer 7 of the OSI model.

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QUESTION 12

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