Questions d'entretiens - Network consulting engineer

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Cisco Systems
On a demandé à un Associate Network Consulting Engineer...21 avril 2011

Explain the difference between TCP and UDP

4 réponses

That's really as difficult as it gets?

UDP packet processing is faster compared to TCP packet processing. This is because once TCP packets are delivered to the destination, an acknowledgement is expected at the transmission end. If no acknowledgement is received, re-transmission of packets occurs at the transmission end. This is opposite to UDP operation, in which no acknowledgement is necessary. Moins

TCP is a reliable protocol that utilizes windowing and acknowledgement packets to ensure all traffic is transmitted and received UDP is an unreliable protocol that does not utilize windowing and acknowledgements, and is good to use when you can't re-transmit a packet (EG a voice or video packet) Moins

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Cisco Systems

What are MAC addresses?

2 réponses

For computers to identify each other on the data link layer, they need a MAC address (hardware address). All devices on a LAN must have a unique MAC address. A MAC address is a 48-bit (six octet) address burned into a network interface card. The first three octets (24 bits) of the MAC address indicate the vendor that manufactured the card. This is called the Organization Unique Identifier (OUI). The last three octets of the MAC address are the unique host address. An example of a MAC address is 00-80-C6-E7-9C-EF. Moins

MAC address is port address or physical address of hardware

Cisco Systems

What are some of the problems that you have solved in your career.

2 réponses

The key in these questions is to cover the fundamentals. There's usually a back-and-forth with the interviewer. Might be worth doing a mock interview with one of the Cisco Network Consulting Engineer experts on Prepfully? They give some real-world practice and guidance, which is pretty helpful. prepfully.com/practice-interviews Moins

Well once in several of our WAN routers(Enterprise external to firewwall but before perimeter) there was a high CPU utilization issue during peak hours upto 99% levels. We looked at the logs and did debugs but the problem wasn't apparent. We opened a Cisco TAC case and were asked to run a battery of commands and the problem was still not giving. I decided to do some embedded packet captures and dedicated a full 12 hour shift to Wireshark output reading from a specific router and there were many types of traffic flowing through! I closely studied it and narrowed down the problem to netflow logging to an external server that constantly interrupted the CPUs. I went ahead and decided to sample them, or log externally only 1 in 200 packets and the peak levels got down to about 75-80%. I went ahead and requested the latest platform of router that did such processing in dedicated hardware modules and the CPU problem was history! **Note that I might be tentatively onto the position as they have moved forward to doing a background investigation and are in the middle of the processs so I would have to say No below on the offer as we are not yet there** Moins

Cisco Systems

What is carrier sense multiple access collision detect (CSMA/CD)?

2 réponses

CSMA/CD stands for carrier sense multiple access/ collision detection used ro detect collision in ethernet. before it sends any request it will verify whether the medium is free or not . if its free then it will send data otherwise it will wait for some time until the medium gets free and then it sends the data...this leads to avoid collisions in the medium Moins

SMA/CD describes the Ethernet access method. In CSMA/CD, many stations can transmit on the same cable, and no station has priority over any other. Before a station transmits, it listens on the wire to make sure no other station is transmitting. If no other station is transmitting, the station transmits across the wire. CSMA/CD is all about devices taking turns using the wire. Moins

Cisco Systems

Why are manhole covers round?

2 réponses

Only shape that can't fall in the hole

I don't know, ask someone at Mimcrosoft.

Cisco Systems

Why Cisco?

2 réponses

Learned about company culture.

The key in these questions is to cover the fundamentals. There's usually a back-and-forth with the interviewer. Might be worth doing a mock interview with one of the Cisco Network Consulting Engineer experts on Prepfully? They give some real-world practice and guidance, which is pretty helpful. prepfully.com/practice-interviews Moins

Aryaka Networks

Air crash GD.

1 réponses

She is constantly changing the topic of GD n as sooon as she changes the topic we hv to share our ideas. Moins

Cisco Systems

None

1 réponses

I have appeared for interview with Cisco Bangalore 3-4 times and at all times my experience in terms of interaction with the team was good and also got positive response from the interviewers but finally did not get any offer. Companies should have a process of informing candidates of the result of the interview process, even if negative, as people take time off from current work to got through the process and keep waiting for the result. Moins

Cisco Systems

How do you think you did in the technical interview? This question is great for testing self-awareness and a candidate's willingness to discuss possible weaknesses or blind spots.

1 réponses

I was honest and said I didn't think I performed very well given I was coming from a very different field. I demonstrated that I could learn quickly and would continue to do so in the job, but recognized that my networking knowledge was not very strong at that point. Moins

Cisco Systems

Basics in networking

1 réponses

The answer should be straight forward and give live examples.

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