TECHNICAL INTERVIEW QUESTIONS ON NETWORKING

1. Describe the OSI model.
2. What is the difference between a repeater, bridge, router? Relate this to the OSI model.
3. Describe an Ethernet switch and where it fits into the OSI model.
4. What is a VLAN? What is an ELAN? What is the difference?
5. Relate FDDI/ATM/SONET to the OSI model.
6. Explain how to configure a host network interface (e.g. IP address, netmask, broadcast address)?
7. Describe Ethernet packet contents: min/max size, header.
8. Describe TCP/IP and its protocols.
9. Describe ATM and what are its current advantages and disadvantages.
10. Describe SONET.
11. What are the maximum distances for CAT5 cabling?
12. Describe UDP and TCP and the differences between the two.
13. What is your current IP address? Hoiw do you find that out on different OSs?
14. Describe what a broadcast storm is.?
15. Describe what a runt, a giant, and a late collision are and what causes each of them.
16. How do you distinguish a DNS problem from a network problem?
17. Describe the Bandwidth Delay problem.
18. Describe the principle of multi-layer switching.
19. Describe the purpose and basic functionality of things like HSRP, VRRP etc.
20.What is the difference between MAC address and IP address ?
21.What is binding order?
22.Explain how traceroute, ping, and tcpdump work and what they are used for?
23.Explain the contents of a routing table (default route, next hop, etc.)
24.Mention some routing protocols that you have configued .
25. Describe what a VPN is and how it works.
26. Describe how VoIP works.
27.Describe methods of QoS.
28.What does Wi-Fi stand for?
29.What does the command “IP name-server 255.255.255.255″ accomplish?
30.How does Asynchronous Transfer Mode (ATM) work?
31.What is a router?
32. What is a gateway?
33.What is LDAP used for?
34.What is the significance of the IP address 255.255.255.255?
35.What is NSLOOKUP ? What options are available in NSLOOKUP ?