ITNW-1358 Chapter 1 - Network Models

How long is a MAC address?

48 bits / 12 hexadecimal characters

Which layer of the OSI model is the only layer divided into two sublayers?

Data Link

Which of the following describes the function of Layer 3 of the OSI model?

It provides connectionless communication using logical addressing

Which of the following describes the function of Layer 3 of the OSI model?

It provides connectionless communication using logical addressing.

What best describes an Application Programming Interface?

It provides programmers with a standard way to extend an application's capabilities

What statement describes a function of a NIC?

It uses the CRC to verify the data within each frame.

What resides at the physical layer of the OSI model?

HUB & Network Cabling

How does the receiving station on a network use the CRC to verify that it received accurate data?

It uses the same divisor as the sending station to find the same remainder.

Which layer of the OSI model is associated with moving data between computers?

Layer 1

Which layer of the OSI model defines a method of transmission using radio waves?

Layer 1; Physical

In the OSI model, physical addressing takes place at the:

Layer 2; Data Link Layer

Which layer of the OSI model adds sender and recipient MAC addresses to frames?

Layer 2; Data Link layer

Which of the following OSI layer contains the LLC function?

Layer 2; Data Link layer

Routers function at which layer of the OSI model?

Layer 3; Network

Which layer are packets created and addressed so they can go from one network to another?

Layer 3; Network

At which of the following layers of the OSI model would TCP/UDP operate?

Layer 4

A network technician is troubleshooting an issue delivering TCP packets to an email server. At which of the following OSI layer is the issue occurring?

Layer 4; Transport

User Datagram Protocol (UDP) resides at :

Layer 4; Transport

Which OSI Layer is responsible for breaking up data into segments?

Layer 4; Transport layer

Which Osi model layer resends packets that were not received in good order?

Layer 4; Transport layer

Which OSI layer assumes responsibility for managing the quality of the connections between applications?

Layer 5; Session Layer

Presentation is layer ____

Layer 6

Layer that does compression

Layer 6; Presentation

Layer that involves the last and most visible part of any network that user interface with?

Layer 7; Application

Each layer in the ____ 7 layer model defines an important function in commuter networking, and the protocols that operate at the layer offer solutions to those functions.

OSI

A device operating at layer 3 uses which of the following protocols to determine the path to a different network?

RIP

What device connects subnets?

Router

Which statement describes a capability of routers?

Routers allow network connections across data lines that do not use Ethernet

Which statement describes a capability of routers?

Routers allow network connections across data lines that do not use Ethernet.

Which layer of the OSI model opens and closes conversations between applications?

Session

How are incoming frames handled by a switch after the MAC address has been established?

The frames are sent only to the interface associated with the destination MAC address.

How are incoming frames handled by a switch?

The frames are sent only to the interface associated with the destination MAC address.

Where does the CRC originate in a network frame?

The sending NIC attaches it

Which layer of the OSI model uses connection-oriented protocols?

Transport

OSI layer 4

Transport Layer

For a network technician, one benefit of understanding the OSI seven-layer model is using it as a primary tool for _____.

Troubleshooting networks

What describes an IP address?

Unique dotted decimal number assigned to every network device

A broadcast MAC address

ff-ff-ff-ff-ff-ff

All NICs on the same network must use the same __________, or they will not be able to communicate with other NICs.

frame type

Which two parts are included in a MAC address?

the Organizationally Unique Identifier (OUI) the device ID of the NIC

Frames in most wired networks holds at most ____?

1500 bytes of data

Which layer of the OSI model refers to the code built into operating systems that enables network-aware applications?

Application

OSI layer 7 is also known as:

Application Layer

Which of the following devices resides at the data link layer of the OSI model?

Ethernet switch

Which device acts as a multiport at the physical layer of the OSI model?

Hub

What unique numeric identifier is assigned to each device on the network by aprotocol in the OSI model's Network layer?

IP address

Which standards organization is names for the Greek work for "equal"?

ISO

How does the receiving station on a network use the CRC to verify that it receives accurate data?

It applies the same math as the sending NIC and checks whether the answer is the same as the CRC

Which statement best describes Logical Link Control (LLC)?

It is an aspect of the NIC that talks to the system's operating system.

Which layer of the OSI model performs IP addressing functions?

Network

Which layer of the OSI model uses routers and IP addresses to ensure that packets arrive at the correct system?

Network

Transport layer resides between which two other layers ?

Network and Session

An oscilloscope is a powerful tool that enables a technician to see __________.

electrical pulses

A MAC address is also known as ______ address

physical