Cyber Security Interview Questions with Correct Answers (100% Accurate)

What port does ping work over? Correct Answer It doesn't. Ping is ICMP, which is layer 3. Ports are not used until layer 4 which handles UDP and TCP. What OSI layer does a router work at? Correct Answer The Network Layer, which is the layer that handles switching, routing, and addressing. Describe Layer 1 of the OSI model Correct Answer Physical Layer Description: Holds the bit streams and electronic impulses over cables, air, or other medium that transmits bit stream signals. Protocols: ATM Examples: Ethernet Describe Layer 2 of the OSI model Correct Answer Data Link Layer Description: Responsible for encoding and decoding data packets into bits. This involves defining packet frames and the structure of the bits streaming across the physical layer. Protocols: Ethernet Frame Relay, IEEE 802.5, PPP Levels: 1) MAC - Media Access Control interfaces with the network medium and gives a unique address to the hardware on the network 2) LLC - Logical Link Control handles flow rate, synchronization of packets, and error checking Examples: Describe Layer 3 of the OSI model Correct Answer Network Layer Description: provides addressing, switching, routing, internetworking, error handling and data flow control. Examples: Protocols: ICMP, ARP, IPv4, IPv6, IPSec, BGP, OSPF Describe Layer 4 of the OSI model Correct Answer Transport Layer Description: transfers data from end to end, ie. one host over a network or the internet to another host. Examples: Protocols: UDP, TCP Describe Layer 5 of the OSI model Correct Answer Session Layer Description: establishes, manages, and terminates conversations between applications at each end. Protocols: SMB, NSF, RPC, SQL