CertiGuide to Network+  9  Appendix A: Answers to Success Questions and Real World Exam Questions       9  Chapter 1010: Real World Exam Answers

Answers to Questions 26-30 1 Answers to Questions 36-40

31. What layers deal with the application of data?

A. Physical

B. Session

C. Transport

D. Application

E. Presentation

Explanation: The first 4 layers of the OSI model deal with data transportation and the top 3 (session, application, and presentation) deal with data application

& Domain 2.2: Identify the 7 layers of the OSI model and their functions.

32. An advantage of a switch over a hub would be?

A. Guarantees wire speed

B. Connects multiple segments

C. Segments by MAC address

D. By definition, connects two or more ports

E. Runs BGP transport protocol

Explanation: A switch is preferable to a hub because is uses the MAC address of devices to create a direct connection (however momentary) between two hosts. This means only two devices can be communicating at a time. By ensuring that only two devices are on the wire, Ethernet collisions become impossible, thereby eliminating the possibility of a collision domain.

Since it creates connections by MAC address, a switch is an inexpensive way to tie together different physical segments, which are usually divided into IP subnets.

The Border Gateway Protocol (BGP) is real; however, it is a routing protocol that operates further up the OSI model than a switch, which is in the Data Link Layer.

& Domain 2.4: Identify the OSI layers to which the following network components operate: Hubs, Switches, Bridges, Routers, Network Interface Cards.

33. Because a hub operates at the lowest level of the OSI model, it performs faster than a switch, which must consume time to make decisions based on the Data-Link layer.

A. False

B. True

Explanation: It is because a switch examines the Mac address at the data link layer that it is able to create collision-free domains that operate at wire speed. The small overhead involved in examining the Mac in a packet is more than offset by these aforementioned advantages.

& Domain 2.4: Identify the OSI layers to which the following network components operate: Hubs, Switches, Bridges, Routers, Network Interface Cards.

34. The __________ layer is responsible for the transmission of a stream of bits over a medium. It defines how the cable is attached to the network adapter and what transmission technique is used to send data over the cable.

A. Physical

B. Network

C. Application

D. Session

E. Transport

Explanation: The Physical Layer (Layer 1) of the OSI model defines data transmission at the hardware level. This includes cabling, NICs, and other physical aspects of networking.

& Domain 2.2: Identify the 7 layers of the OSI model and their functions.

35. The UDP protocol operates at which layer of the OSI model?

A. Transport

B. Network

C. Physical

D. Session

E. Application

Explanation: The Transport Layer describes the quality and nature of the data being delivered. It defines if and how retransmissions will be used to ensure data delivery and is where protocols such as UDP, SPX and ATP exist.

& Domain 2.2: Identify the 7 layers of the OSI model and their functions.

Answers to Questions 26-30 1 Answers to Questions 36-40