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