Computer Science

1. List the seven OSI layers in the indicated sequence where layer 7 is closest to the end user.

Layer 7:

Layer 6:

Layer 5:

Layer 4:

Layer 3:

Layer 2:

Layer 1:

2. Compare the total number of links in an 11 node network for:

a) Mesh Topology

b) Star Topology (counting the hub as one of the nodes)

c) Ring Topology

d) Bus Topology

3. Which OSI layer, by number or name, is most applicable to the following? (Note: All layers are represented at least once)

__________ a) Addressing messages between two processes

__________ b) Bits:

__________ c) Congestion control:

__________ d) Determine where a frame starts and ends

__________ e) Frames

__________ f) Internet browsers

__________ g) Establishing, maintaining, and terminating a Session:

__________ h) Translation between different coding systems

__________ i) Route Determination

__________ j) Interface to transmission media

4. Use the OSI Model Learning Object to determine which OSI layer, by number or name, is most applicable to the following protocols.

(Note: All layers are represented at least once)

___________a) CDR – Common Data Representation

___________b) IPSec – Internet Protocol Security Protocol

__________ c) WEP – Wired Equivalent Privacy

_________ d) PAP – Password Authentication Protocol

__________ e) SMTP – Simple Mail Transfer Protocol

__________ f) TLS –Transport Layer Security

__________ g) SSH – Secure Shell

__________ h) X.21:a – a specification for serial communications over synchronous lines

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