A Lan administrator sets up a local area network in an organization. He monitors the daily activities on the network. His work includes testing and maintenance of the connectivity of the network. The job requires strong technical skills in computer networks and data communications.
I am here providing few important interview questions that are generally asked in an interview of Lan Administrator:
1. What is a MAC address?
MAC Stands for Media Access Control address. It is a hardware address that helps in the unique identification of each node on the network. It is assigned to NICs by the manufacturer. It is used for identification. This address is basically the physical address of the machine. The commonly used numbered spacings in a MAC address are EUI-48, EUI-64 and MAC-48.EUI stands for Extended Unique identifier.
2. What is the difference between TCP and UDP?
The differences in the two protocols are listed as under:
- TCP is a connection oriented protocol whereas UDP is a connectionless protocol.
- TCP is more reliable than UDP.
- TCP is ordered while UDP is not ordered.
- TCP is heavyweight while UDP is light weight.
- TCP reads data streamlined whereas UDP sends data in packets.
Some common examples of TCP are: Apache TCP port, SMTP TCP port.
Some common examples of UDP are DNS UDP port 53, TFTP.
3. Differentiate between unspecified passive open and a fully specified passive open.
In a fully specified passive open, the server waits for a connection request from a specific client while in unspecified passive open the server waits for a connection from a client.
4. What is MAC spoofing?
MAC spoofing is a hacking technique. It is carried out to change the MAC address of the network card. This may cause severe problems like bypassing of that node in the network connection. Various programs through which MAC spoofing can be done are SMAC, Technitium MAC address changer, iproute2, ifconfig.
5. What is the difference between a switch, a hub, and a router?
A router routes the network traffic from one network to another. It reads the packet header and forwards it to the port where the packet needs to get transferred. It also filters traffic according to the subnetting technique.
Switch and hub are both networking devices used for expanding the network. However a switch behaves more intelligently than a hub as it will direct the packet to the destination computer only. A hub will broadcast that packet to all computers in the network and hence can slow down the network speed.
These are some of the commonly asked interview questions. All the Best!
