Chapter 1 Internetworking / OSI Model Reference

An example of a device that operates on the physical layer is a ____________. A. Hub B. Switch C. Router D. Bridge

A. Hubs operate on the Physical Layer as they have no intelligence and send all traffic in all directions.

Which of the following statements is/are true with regard to the device shown below? (Choose all that apply.) A. It includes one collision domain and one broadcast domain B. It includes one collision domain and 10 broadcast domains C. It includes 10 collision domains and one broadcast domain D. It includes one collision domain and 10 broadcast domains E. It includes 10 collision domains and 10 broadcast domains

A. The device shown is a hub and hubs place all ports in the same broadcast domain and the same collision domain.

Which if the following is the ONLY device that operates at all layers of the OSI model? A. Network host B. Switch C. Router D. Bridge

A. The following network devices operate at all seven layers of the OSI model: network management stations (NMSs), gateways (not default gateways), servers and network hosts.

Which of the following layers of the OSI model is not involved in defining how the applications within the end stations will communicate with each other as well as with users? A. Transport B. Application C. Presentation D. Session

A. The top three layers define how the applications within the end stations will communicate with each other as well as with users.

Which of the following is NOT a function carried out on the Application layer of the OSI model? A. email B. data translation and code formatting C. file transfers D. client/server processes

B. Data translation and code formatting occur on the Presentation layer of the OSI model.

The most effective way to mitigate congestion on a LAN would be to__________________? A. Upgrade the network cards B. Change the cabling to CAT 6 C. Replace the hubs with switches D. Upgrade the CPUs in the routers

C. Replacing the hub with a switch would reduce collisions and retransmissions which would have the most impact on reducing congestion.

Which of the following layers of the OSI model was later subdivided into two layers? A. Presentation B. Transport C. Data Link D. Physical

C. The IEEE Ethernet Data Link layer has two sublayers, the Media Access Control (MAC) and the Logical Link Control (LLC).

Which of the following is an example of a routed protocol? A. EIGRP B. IP C. OSPF D. BGP

B. Protocols used to support data traffic are called routed protocols and some key examples of them include IP and IPv6.

Which of the following statements is not true with regard to routers? A. They forward broadcasts by default B. They can filter the network based on Network layer information C. They perform path selection D. They perform packet switching

B. Routers by default do NOT forward broadcasts.

With respect to the OSI model, which of the following are correct statements about PDUs? A. A segment contains IP addresses. B. A packet contains IP addresses. C. A segment contains MAC addresses. D. A packet contains MAC addresses.

B. The contents of a protocol data unit (PDU) depend on the PDU as they are created in a specific order and their contents are based on that order. A packet will contain IP addresses but not MAC addresses as MAC addresses are not present until the PDU becomes a frame.

You need to provide network connectivity to 150 client computers that will reside in the same sub network, and each client computer must be allocated dedicated bandwidth. Which device should you use to accomplish the task? A. Hub B. Switch C. Router D. Bridge

B. You should use a switch to accomplish the task in this scenario. A switch is used to provide dedicated bandwidth to each node by eliminating the possibility of collisions on the switch port where the node resides. Switches work at layer 2 in the Open System Interconnection (OSI) model and perform the function of separating collision domains.

Switches break up _______________ domains and routers break up _____________ domains. A. broadcast, broadcast B. collision, collision C. collision, broadcast D. broadcast, collision

C. Switches create separate collision domains within a single broadcast domain. Routers provide a separate broadcast domain for each interface.

Which of the following is NOT a benefit of using a reference model? A. divides the network communication process into smaller and simpler components B. encourages industry standardization C. enforces consistency across vendors D. allows various types of network hardware and software to communicate

C. While it is true that the OSI models primary purpose is to allow different vendors networks to interoperate, there is no requirement that any vendor follows the model.

You are the Cisco administrator for your company. A new branch office is opening and you are selecting the necessary hardware to support the network. There will be two groups of computers, each organized by department. The Sales group computers will be assigned IP addresses ranging from 192.168.1.2 to 192.168.1.50. The Accounting group will be assigned IP addresses ranging from 10.0.0.2 to 10.0.0.50. What type of device should you select to connect the two groups of computers so that data communication can occur? A. Hub B. Switch C. Router D. Bridge

C. You should select a router to connect the two groups. When computers are in different subnets, as these two groups are, you will require a device that can make decisions based on IP addresses. Routers operate at layer 3 of the Open Systems Interconnect (OSI) model and make data-forwarding decisions based on layer 3 networking information, which are IP addresses. They create routing tables that guide them in forwarding traffic out of the proper interface to the proper subnet.