Interview questions on networking basics

1. 1. What is the destination mac-address of an ARP request frame
Broadcast
2. Is ARP used on a PPP link
No
3. What type of packet is a DHCP Discover packet
DHCP Discover is a layer 3 broadcast packets with destination IP address,
255.255.255.255
4. What is an IP Helper address feature and why is it required in a DHCP
environment
DHCP Discover packets are broadcast packets. This means that a DHCP Discover
packet which is sent from the client would not reach the DHCP Server, if the server
resides on a different network. This is because, routers are required for
communication between different networks and routers do not forward broadcast
packets. The IP Helper address feature is configured on the router. The feature
informs the router the DHCP Servers IP address for the network. So, when the router
receives the DHCP Discover packet, it would convert it from broadcast to unicast
packet and then send it to the DHCP Server.
5. If a computer is configured with a default gateway address, should the same
address be used as the DNS server IP address
It is not mandatory. The DNS server IP address can be any value provided the
computer has access to it.
6. What happens when you ping a DNS server IP address
A response to the ping is sent by the DNS server IP address.
7. How much data can be send in a Single FTP session
The amount of data which can be send is infinite. FTP uses TCP. The TCP channel
can be used until the complete data is transferred. Multiple TCP segments can be used
within the same TCP channel.
8. A user logs into a HTTPS based form on a website with his username and
password. Would the username or password be encrypted during the session

2. Both the username and password would be encrypted in a HTTPS based
communication.
9. Would the authentication between a HTTPS Web client and a Web Server be
successful if the client does not have a client certificate?
Authentication with client certificate is optional. The client can successfully
authenticate with the server using a username and password.
10. Does an IP v4 packet include subnet mask in the header
IP v4 header does not include subnet mask in the header
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