OSI and TCP/IP Models (Lesson 1)

Which layers of the Open System Interconnection (OSI) model contain products that create the physical and logical topologies of network segments? (Select two) A) Layer 1 B) Layer 2 C) Layer 3 D) Layer 4

A, B

What are the layers of the TCP/IP model?

1. Network Access 2. Internet 3. Transport 4. Application

What OSI model layer transmits bits from one device to another and modulates the transmission stream over a medium?

1. Physical

What OSI layers correspond to TCP/IP Network Access?

1. Physical 2. Data Link

What are the layers of the OSI model?

1. Physical 2. Data Link 3. Network 4. Transport 5. Session 6. Presentation 7. Application

Which OSI layer packages bits of data from the Physical layer into frames?

2. Data Link

What OSI layers correspond to TCP/IP Internet?

3. Network

Which OSI layer handles the concept of logical addressing?

3. Network

How many layers in the TCP/IP model?

4

At which OSI layer is the concept of a port number introduced?

4. Transport

What OSI layers correspond to TCP/IP Transport?

4. Transport

Which OSI layer is responsible for establishing reliable connections between two devices?

4. Transport

What OSI layers correspond to TCP/IP Application?

5. Session 6. Presentation 7. Application

How many layers in the OSI model?

7

At which OSI layer do programs on a network node access network services?

7. Application

Identify the layer that does not add a header to the data payload. A) Physical B) Network C) Transport D) Application

A

Summarize the purpose of the Internet Engineering Task Force (IETF). A) the IETF focuses on solutions to Internet problems and the adoption of new standards. B) the IETF is the technical committee responsible for setting Internet standards and publishing these standards. C) the IETF encourages the development and availability of the Internet, and provides organizational resources to the IAB. D) the IETF manages allocation of IP addresses and maintenance of the top-level domain space.

A

A packet is being sent from Network 1 to Network 4. The shortest route is for the packet to use the path 1234. A router fails at Network 3 and the packet uses an alternate path of 1254. This scenario depicts the application of which of the following technology? A) circuit-switched path B) packet switching C) circuit D) fragmentation

B

Consider the features of Protocol Data Units (PDUs) and determine what role encapsulation performs during communications. A) enables communication between nodes at the same layer B) describes how data should be packaged C) describes where data should go D) enables systems to communicate by exchanging data

B

Compare the Open System Interconnection (OSI) model and the Transmission Control Protocol/Internet Protocol (TCP/IP) protocol stack and determine which statements accurately distinguish between the two. (Select two). A) the TCP/IP protocol stack consists of 5 layers compared to the 7 layers found in the OSI model. B) the Application layer of TCP/IP consolidates Layers 5-7 of the OSI model. C) PPP, PPTP, and L2TP occur at the Link layer of the TCP/IP protocol stack and occur at Layer 2 of the OSI model. D) TCP and UDP occur at the Internet layer of the TCP/IP protocol stack.

B, C

Differentiate between the characteristics of a Local Area Network (LAN) and a Wide Area Network (WAN). A) a LAN is limited in size and typically has less than 1000 nodes while a WAN is unlimited in size. B) a WAN is limited in size and typically has less than 1000 nodes while a LAN is unlimited in size. C) a LAN is a network with one geographic location while a WAN is spread across multiple geographic locations with shared links. D) a WAN is a network with one geographic location while a LAN is spread across multiple geographic locations with shared links.

C

Summarize the functions of the Link layer in the Transmission Control Protocol/Internet Protocol (TCP/IP) protocol stack. A) the Link layer establishes connections between the different applications that the source and destination hosts use to communicate. B) the Link layer is where many of the high level protocols can be run, such as File Transfer Protocol (FTP). C) the Link layer defines the host's connection to the network media and includes the hardware and software involved in the interchange of frames between hosts. D) the Link layer provides addressing and routing functions along with the ability to fragment large frames from the Network Interface layer into smaller packets.

C

Evaluate the roles of Layer 1 and Layer 2 of the Open Systems Interconnection (OSI) model. Which of the following devices are part of Layer 2? (Select two) A) hub B) modem C) bridge D) network interface card

C, D

Summarize the role of Layer 6 in the Open System Interconnection (OSI) model. A) provides an interface for software programs on network hosts that have established a communications channel B) administers the process of establishing the dialog, managing data transfer, and then ending the session C) moves data around an internetwork using logical network and host IDs D) transforms data between the format required for the network and the format required for the application

D

What is fragmentation?

Dividing the contents of large messages into smaller packets for delivery over an internetwork.

True or False? The Session layer is responsible for passing data to theNetwork layer at the lower bound and the Presentation layer at theupper bound.

False