D481 Security Foundations - Questions With
Tailored Solutions
What are the layers of the OSI model? Right Ans - 7. Application
6. Presentation
5. Session
4. Transport
3. Network
2. Data Link
1. Physical
What are the layers of the TCP/IP Reference Model? Right Ans -
Application
Transport
Internet or Network
Network Access or Physical
What is the difference between the OSI and TCP/IP models?
Right Ans - OSI = prescriptive model; shows how to develop a
network software
TCP = descriptive model; explains how the internet protocol suite
operates
,What is a circuit-switched network? Right Ans - o creates a path
b/n the source and destination devices; uses the same path
throughout the conversation
o occurs at the physical layer and retains message order since both
devices own the circuit
o supports real time communication w/o delays
o transmits complete messages
What is a packet-switched network? Right Ans - o transmits
messages as individual packets; takes multiple different paths to the
destination
o drawbacks -- transmission delay and latency
What is TCP? Right Ans - o Transmission Control Protocol;
operates at OSI Layer 4 (Transport)
o TCP **VERIFIES* packets are sent and received
, What is UDP? Right Ans - o User Datagram Protocol
sends packets without verifying or checking for errors.
What is IP? Right Ans - Internet Protocol; operates at OSI Layer 3
(Network)
o handles routing decisions to get packets from their source to
destination
o enables unified communications (convergence of voice, video, &
data apps)
What protocols commonly operate in the Transport Layer (OSI
Layer 4)? Right Ans - o Transmission Control Protocol (TCP)
o User Datagram Protocol (UDP)
o AppleTalk Transaction Protocol (ATP)
o Stream Control Transmission Protocol (SCTP)
o NetBIOS Frames Protocol (NFP)
o Fibre Channel Protocol (FCP)
Tailored Solutions
What are the layers of the OSI model? Right Ans - 7. Application
6. Presentation
5. Session
4. Transport
3. Network
2. Data Link
1. Physical
What are the layers of the TCP/IP Reference Model? Right Ans -
Application
Transport
Internet or Network
Network Access or Physical
What is the difference between the OSI and TCP/IP models?
Right Ans - OSI = prescriptive model; shows how to develop a
network software
TCP = descriptive model; explains how the internet protocol suite
operates
,What is a circuit-switched network? Right Ans - o creates a path
b/n the source and destination devices; uses the same path
throughout the conversation
o occurs at the physical layer and retains message order since both
devices own the circuit
o supports real time communication w/o delays
o transmits complete messages
What is a packet-switched network? Right Ans - o transmits
messages as individual packets; takes multiple different paths to the
destination
o drawbacks -- transmission delay and latency
What is TCP? Right Ans - o Transmission Control Protocol;
operates at OSI Layer 4 (Transport)
o TCP **VERIFIES* packets are sent and received
, What is UDP? Right Ans - o User Datagram Protocol
sends packets without verifying or checking for errors.
What is IP? Right Ans - Internet Protocol; operates at OSI Layer 3
(Network)
o handles routing decisions to get packets from their source to
destination
o enables unified communications (convergence of voice, video, &
data apps)
What protocols commonly operate in the Transport Layer (OSI
Layer 4)? Right Ans - o Transmission Control Protocol (TCP)
o User Datagram Protocol (UDP)
o AppleTalk Transaction Protocol (ATP)
o Stream Control Transmission Protocol (SCTP)
o NetBIOS Frames Protocol (NFP)
o Fibre Channel Protocol (FCP)
