Microsoft Networks and Security Written Test

1. How do you use RSA for both authentication and secrecy?

2. What is ARP and how does it work?

3. What's the difference between a switch and a router?

4. Name some routing protocols? (RIP,OSPF etc..)

5. How do you do authentication with message digest(MD5)? (Usually MD is used for finding tampering of data)

6. How do you implement a packet filter that distinguishes following cases and selects first case and rejects second case.

i) A host inside the corporate n/w makes a ftp request to outside host and the outside host sends reply.

ii) A host outside the network sends a ftp request to host inside. for the packet filter in both cases the source and destination fields will look the same.

7. How does traceroute work? Now how does traceroute make sure that the packet follows the same path that a previous (with ttl - 1) probe
packet went in?

8. Explain Kerberos Protocol ?

9. What are digital signatures and smart cards?

10. Difference between discretionary access control and mandatory access control?

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Amarendra Tallam

  • Feb 10th, 2006
 

What is ARP and how does it work?

Defination:

ARP (Address Resolution Protocol) is a protocol for mapping link layer addresses to a physical machine address that is recognized in the local network

Working:

When a host wants to send a packet with to a known network address on the local area network (either to another host on the network or to a default gateway), the host asks the ARP program to find a physical host that matches the network address. The ARP program looks in the ARP cache and, if it finds the address, provides it so that the packet can be converted to the right packet length and format and sent to the machine. If no entry is found for the specific network address, ARP broadcasts a request packet in a special format to all the machines on the LAN to see if one machine has that address. A host that recognizes the network address as its own returns a reply so indicating. ARP updates the ARP cache for future reference and then sends the packet using the resolve physical address.

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