Interview Questions.

Q1. How To Troubleshoot A High Cpu Utilization Problem In A Router?

This symptom is the sign of ordinary capability in a router. First we must know the precise cause for accelerated CPU utilization, and we will use “display tactics cpu ,” “display interface stat” instructions to test the manner utilizations. It will be because of excessive visitors flow (congestion), complex ACL or VPN deployments, ARP/TCP issues and so on.

Q2. How To Perform Password Recovery In A Switch?

Every transfer series has its very own set of restoration methods. Here you could describe the manner of password restoration for the switches on which you have shown your work revel in. You can also refer following hyperlinks to get an idea of password restoration on famous Cisco switches.

Q3. If My Bgp Neighbor Is Stuck In Idle, Or Active State, What Should I Do?

If BGP peer is in idle nation then it may be due to bodily connectivity failure or neighbor is not defined with well with respective AS. In join nation, BGP attempts to set up TCP consultation over port quantity 179 if it fails to set up TCP connection then it goes to Active state wherein it retries to establish TCP connection. By the use of debug ip bgp and debug ip tcp tractions commands, we are able to discover the exact motive of TCP connection failure. Lack of “update-source” or “ebgp-multihop” command also can be a motive for neighbor energetic kingdom;

Q4. Which Fields In A Packet Does A Network Layer Firewall Look Into For Making Decisions?

IP and trport layer headers for information associated with supply and destination IP addresses, port numbers and so forth.

Q5. What Will Happen If One Of The Ports Goes Down Of An 8 Port Etherchannel?

The average bandwidth of an EtherChannel interface depends on its active member hyperlinks. An EtherChannel with 8 lively one hundred Mbps links ought to suggest a bandwidth of 800 Mbps and, if one of its bodily ports fails, the to be had bandwidth of port-channel interface may be evaluated as 700Mbps without flapping the port-channel.

Q6. Which Feature On A Firewall Can Be Used To Block A Specific Url Or A Website?

URL Filtering.

Q7. Which Feature On A Cisco Firewall Can Be Used For Protection Against Tcp Syn Flood Attacks?

TCP intercept characteristic.

Q8. What Type Of Firewall Can Be Used To Block A Web Security Threat?

A net application firewall or a layer 7 firewall can be used for the purpose.

Q9. What Is The Significance Of The Variable Ip-ospf-trmit-delay?

If OSPF is configured on low bandwidth hyperlinks, IP-OSPF-Trmit-Delay is used to growth the time of the age area of a LSA replace. By default it is set to at least one 2d and, to make it effective, it must be delivered earlier than trmission over a hyperlink.

Q10. Which Is The Main Field In An Ip Header , Which Is Modified By A Nat Firewall?

The source IP cope with in the IP header.

Q11. What Type Of Firewall Can Be Configured For Providing User Based Authentication To Users On The Lan Network.?

Proxy firewall.

Q12. Is It Normal To Get Crc Errors On Mpls Wan Links?

It may be regular if it's miles less than 1% of total site visitors on that interface without a packet drop

And it's miles endorsed to remedy hyperlink problems in case cyclic redundancy test (CRC) mistakes are more than 1% of the total interface traffic. The maximum commonplace cause for receiving CRC errors is the duplex placing, as maximum of companies set their interface to “vehicle” mode.