1) TCP is a connection-oriented protocol. An advantage of operating in a connection-oriented environment is that a connection is established between both ends before the transfer of information can begin. What is a disadvantage of using a connection-oriented protocol such as TCP?
A. Packet acknowledgement may add overhead.
B. Packets are not tagged with sequence numbers.
C. Loss or duplication of data packets is more likely to occur.
D. The application layer must assume responsibility for correct sequencing of the data packets.

2) Which layer of the OSI model ensures reliable end-to-end delivery of data?
A. Application
B. Presentation
C. Session
D. Transport
E. Network

3) What is the correct order of PDUs in data encapsulation?
A. Data, Frame, Packet, Segment, Bit
B. Data, Frame, Segment, Packet, Bit
C. Data, Packet, Frame, Segment, Bit
D. Data, Packet, Segment, Frame, Bit
E. Data, Segment, Frame, Packet, Bit
F. Data, Segment, Packet, Frame, Bit

4) What are the advantages of using the OSI layered network model? (Choose three.)
A. Allows multiple-vendor development through standardization of network components.
B. Creates a list of communication rules that all companies must implement to get onto the Internet.
C. Allows various types of network hardware and software to communicate.
D. Prevents changes in one layer from affecting other layers, so it does not hamper development.
E. Allows companies to develop proprietary interfaces

5) You just finished installing a new operating system on a computer located in the accounting department. You would like to verify the network configuration from the new computer so you establish FTP connection to a remote TFTP server. Which layer of the OSI model did you use for this operation?
A. Application
B. Presentation
C. Session
D. Transport
E. Data link
F. Internet

6) Which of the following are functions that occur at the transport layer of the OSI model? (Choose three)
A. Route selection-IP
B. Sliding window-UDP
C. Well known ports-IP
D. Route validation-ICMP
E. Connection oriented-TCP/IP
F. Three way handshake TCP/IP
G. No acknowledgement-UDP

7) Which layer of the OSI model handles data translation, code formatting, and encryption occur?
A. Physical
B. Data link
C. Network
D. Transport
E. Session
F. Presentation

8) Which layer of the OSI model uses packets as the PDU (Protocol Data Unit)?
A. Data link
B. Session
C. Presentation
D. Network
E. Transport

9) Which of the following are layer 7 protocols? (Choose two.)
A. Ping
B. Telnet
C. FTP
D. TCP
E. IP

10) Routing Protocols use which OSI layer to determine the best path to a network?
A. Data Link
B. Network
C. Physical
D. Presentation
E. Session
F. Transport