Questions

1. How many layers constitute the OSI reference model?
   1. 4
   2. 7
   3. 5
   4. 1

2. A technician is troubleshooting a connectivity problem on a host machine and his manager asks him to troubleshoot using the bottom-to-top methodology. What layer of the OSI model should he start at?
   1. The Data Link Layer
   2. The Network Layer
   3. The Application Layer
   4. The Physical Layer
3. An engineer has captured the following output from a host machine:

Which layer of the OSI reference model is this output most applicable to?

4. 1. The Transport Layer
   2. The Network Layer
   3. The Application Layer
   4. The Session Layer

4. A network architect has designed a plan for connecting hosts in a new office, but he has realized that he needs to provide more physical ports for these hosts. Which of the following layer 2 devices would be most appropriate to provide these ports?
   1. A router
   2. A switch
   3. A hub
   4. A WAP
5. Which sub layer of the Data Link Layer controls which host is allowed to access a shared Ethernet link at a particular point in time?
   1. The LLC sub layer
   2. The MAC sub layer
   3. The IP sub layer
   4. The UDP sub layer
6. An engineer is examining frames from a particular host machine that is exhibiting issues on the network, and notices that headers from higher-level protocols are present in the frame. This is due to the process of:
   1. Decapsulation
   2. Connectionless transport
   3. Encryption
   4. Encapsulation
7. A security administrator has received notice that management wishes to block access to a particular application on port 80, but not interfere with other traffic communicating through that same port. What device will be most suitable to implement this rule?
   1. A router
   2. A switch
   3. An L7 firewall
   4. An L3 firewall
8. A network administrator is analyzing TCP traffic in an effort to better understand connection-oriented transmissions. What types of PDUs should he be analyzing?
   1. Frames
   2. Datagrams
   3. Segments
   4. Packets

9. The leader of the fiber team has just called to report that a truck has pulled down overhead cables in a particular area, and that services will be interrupted until splicing works can be completed. What layer of the OSI model can this be best classified as?
   1. Physical
   2. Application
   3. Transport
   4. Network
10. An engineer has purchased a wireless repeater that works by simply retransmitting the bits that it receives over its coverage area. What layer does this device most likely operate at?
    1. Network
    2. Data Link
    3. Application
    4. Physical