Networking Protocols interview questions

The following are networking protocols interview questions. Test your knowledge on these protocols before attending a network engineer interview.

Which networking protocol can be used to remotely access files on a server

FTP protocol.

Which protocol does ping use at the transport layer

Ping does not have a transport layer protocol. It uses ICMP at the network layer.

Which TCP port numbers does FTP use

FTP use two TCP port numbers. These are TCP port 20 and 21.

Which networking protocol can be used to view a remote desktop when the client is Windows and Server is Linux

VNC.

Which networking protocol can be used to view a remote desktop when the client is Windows and Server is also Windows

Remote desktop or VNC can be used.

Which protocol does switches use to prevent looping

Spanning tree protocol (STP)

Which transport layer protocol does DHCP use

UDP

Does ping use a transport layer protocol

No. Ping does use any transport layer protocol. It uses ICMP at the network layer.

Which protocol is used to resolve website name into IP address

DNS

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Which protocol is used for secure web browsing

https

Which protocol and port number does https use at the transport layer

https use tcp at the transport layer and the port number 443.

Which transport layer protocol does both http and https use ?

TCP

Name two protocols which can be used to access a remote router

telnet and ssh.

Which protocol is used to resolve mac-address to IP address

ARP protocol.

Which are the two IPSEC protocols

ESP and AH.

Do SSL and IPSEC VPN work on the same port number.

No. They work on different port numbers. Also SSL uses TCP and IPSEC uses UDP for communication.

Which layer does SSL and IPSEC VPN work ?

Layer 4 and Layer 7

Which protocol is used for dynamically allocating addresses to clients on the network.

DHCP

Name two insecure networking protocols

Telnet and HTTP.

Which protocol does https use for encryption.

SSL.

What are the the two types of FTP protocol

Active and Passive FTP.

Does static routing use any protocols

No.

Which protocol is used by routers for sending messages to the initiator if the path to a network is not available.

ICMP

Which protocol is used on a LAN segment to identify the mac-address of a device based on its IP address.

ARP

Can the ARP protocol cross two networks.

No. The ARP protocol cannot cross two networks. They are local to a specific subnet and cannot reach other subnets.

Name the VLAN protocol which is vendor neutral

802.1q

Which protocol does EAP-TLS use to derive session keys in a 802.1x authentication.

TLS protocol.