Network Administrator Linux Interview Questions

Network Administrator Linux Interview Questions
1. Give an example of set of shell commands that will give you the number of files in a directory
2. How do you tell what process has a TCP port open in Linux
3. On a Red Hat Linux Variant how do you control whether a service starts when the system boots
4. How do you tell the amount of free disk space left on a volume
5. Give an example of a set of shell commands to tell how many times “bob” has logged on to the system this month
6. Give an example of a recursively copying a directory from one location to another.
7. How do you modify the IP and Net mask of a system running a Red Hat Variant of Linux
8. Give an example of a set of shell commands that will give you the number of “httpd” processes running on a Linux box.
9. On CentOS or Fedora based system using the package management application, how do you tell what package provided the file “libnss_ldap.so”
10. What is the difference between VTP client, server, and transparent
11. What is the maximum length of CAT6
12. How does one set up a layer two link to share VLANs
13. How does one implement redundant links at Layer 2
14. What is the difference between a hub, switch, and a router? What are the security advantages of switch vs. hub?
15. Show an example of using telnet to learn the headers of an http server.
16. In what OSI layer does PPP exist
17. What’s the difference between TCP and UDP
18. Given a DNS server that has just started (with an empty cache) and host contacting this DNS server (using it’s OS setting) to learn an address for google.com, list the steps the DNS server will take to learn it with IP addresses (each step will have multiple possible IP addresses – you need choose only one per step).
19. Why are layer 2 loops bad, and what protocol was designed to prevent them
20. Given a radius server at 10.0.0.2 and a shared key of ‘abc123′ show the IOS commands necessary to authenticate switch users against the radius server, while still allowing the use of local username / password pairs

Networks interview Questions

Networks interview Questions
What are general middleware?
what is CLIENT/SERVER
What are the functions of the typical server program?
What are super servers?
What is .OST file?
what are the important topologies for networks?
What is a pseudo tty?
Under what situations a packet can go into infinite loop in a network ?
Name any field of ip header that can prevent a packet to loop infinitely ?
What is the minimum and maximum length of the header
What is multicast routing?
what is beaconing?
What is the difference between routable and non- routable protocols?
What is the main purpose for creating this osi model?
What is BROUTER?
what is sub netting? Why is it used?
What is the difference between the communication and transmission.
What are the types of transparencies?
What are the five major technologies that can be used
What are the types of servers?
What is the ROUTER?how it is work?
What is meant by asymmetrical protocols?
What is the default subnet mask for an ipv6 address ?
How gateway is different from routers?
what is a vlan?what does vlan provide?
What is external data representation?
What is the difference between interior and exterior neighbor gateways?
What is SLIP (serial line interface protocol)?
What is the difference between pop3 and imap mail server?
What is attenuation?
Difference between the communication and transmission?
What is wide-mouth frog?
What are the advantages and disadvantages of the three types of routing tables?
Name three network tools used to determine where a network
What is NETBIOS and NETBEUI?
What is source route?
What is ICMP?
What does CIDR stand for?
What is the network time protocol?
What is a bridge?
What is a TP monitor?

Baisic Network admin questions

Some of the Top Basic Computer Networks Questions, that must be Answered and known if you even think of attending any Networks/Network Admin Interviews.

1. Virtual meetings on Internets are called………….
2. LAN can be connected by devices called………..
3. The bit pattern …………… is the preamble of 802.3 frame format.
4. Basic SONET frame is a block of ……………. bytes.
5. The amount of thermal noise is measured by ………………..
6. Explain the Frequency Modulation.
7. What is WAN and where it is used? how it is different from LAN and MAN.
8. Explain single error detecting code with example.
9. What is Flow control? Explain.
10. Explain CSMA/CD Protocol.
11. Describe Multitasking.
12. Describe Service Primitives.
13. Explain briefly PCM and its requirements.
14. What is Concession Control describe i) Load shedding ii) Jitter Control. Under it.
15. What is QoS?
16. Token Bucket Algorithm is employed to prevent congestion. The capacity of the bucket is 250k byes Arriving rate of the token is 2MB/sec. if the maximum output rate is 25MB/sec, calculate the burst length in time.
17. Describe principles considered in the design of network layer in the internet.
18. Describe Address format used in Internet. [ With figure ]
19. A Network on the Internet has a Subnet mask of 255.255.240.0. What is the maximum No. of hosts it can handle?
20. What are basic difference between IPV4 and IPV6?
21. Describe Address Resolution Protocol, use diagram if required.
22. What is the difference between Interior gateway protocol and Exterior gateway protocol.
23. What is the function of ATM adaptation layer.
24. Illustrate the phenomenon of Silly Window Syndrome in TCP.
25. What is delayed duplicate problem?
26. Explain Unicast addresses, Multicast adresses, and broadcast address.