40 Questions
What is the primary function of the Data Link Layer?
To encapsulate Layer 3 packets into Layer 2 frames
What is the purpose of the LLC sublayer?
To communicate between networking software and device hardware
What is the function of the MAC sublayer?
To manage media access control and data encapsulation
What is the purpose of the Data Link Layer in terms of error detection?
To reject corrupted frames
What is the relationship between the Data Link Layer and the Physical Layer?
The Data Link Layer converts information into a format supported by the Physical Layer
What is the purpose of the IEEE 802 LAN/MAN standards?
To standardize network protocols across different networks
What is the function of the Data Link Layer in terms of Layer 3 packets?
To encapsulate Layer 3 packets into Layer 2 frames
What is the purpose of the Data Link Layer in terms of network interfaces?
To allow multiple Layer 3 protocols to use the same network interface and media
What does the data link layer 'see' when controlling data access to the media?
Logical topology
What is the primary purpose of the Data Link Layer?
To provide access to media
What is the result of a duplex mismatch between two interconnected interfaces?
Inefficiency and latency on the link
What influences the type of network framing and media access control used?
Logical topology
What is the function of the MAC sublayer?
To resolve contention for access on the network medium
What is the simplest and most common WAN topology?
Point-to-point
What is the process called when a router receives a frame, de-encapsulates the packet, and re-encapsulates it into a new frame?
Store-and-forward switching
What is a characteristic of a hub and spoke WAN topology?
Branch sites cannot exchange data without going through the central site
What is a benefit of a mesh WAN topology?
High availability
What type of communication allows both devices to simultaneously transmit and receive on a shared medium?
Full-duplex communication
What is the primary function of a router interface?
To encapsulate packets into frames
What is a characteristic of a physical point-to-point WAN topology?
Nodes do not share the media with other hosts
What is a benefit of using a serial communications protocol like Point-to-Point Protocol (PPP) in a WAN?
Node does not have to determine frame destination
How do devices operate when they have the same duplex mode?
They operate efficiently
What is a characteristic of Point-to-Point WAN protocols?
Very simple
What happens to packets as they travel from a local host to a remote host?
They may experience numerous data link layers and media transitions
What happens when two devices transmit at the same time?
A collision occurs
What mode do CSMA/CD and CSMA/CA operate in?
Half-duplex mode
What is the purpose of the collision detection process in CSMA/CD?
To govern when a device can send and what happens if multiple devices send at the same time
What happens to the data sent by both devices in the event of a collision?
It is corrupted and needs to be re-sent
What is an Ethernet hub also known as?
A multiport repeater
What is the main difference between CSMA/CD and CSMA/CA?
CSMA/CD is used by legacy Ethernet LANs, while CSMA/CA is used by IEEE 802.11 WLANs
What does the NIC compare during the collision detection process?
The data transmitted with the data received
What is the purpose of the collision avoidance process in CSMA/CA?
To avoid collisions by waiting before transmitting
What is the purpose of including the time duration in the transmission in CSMA/CA?
To inform other devices when the medium will be unavailable
Why do Ethernet LANs using switches not use a contention-based system?
Because they operate in full-duplex mode
What is the purpose of the data link layer wrapping the Layer 3 PDU with a header and trailer?
To make the data intelligible between Layer 3 of the sending and receiving hosts
What is the primary function of the data link protocol?
To enable NIC-to-NIC communications within the same network
What are the three parts of a data link frame?
Header, Data, Trailer
What determines the amount of control information carried in a data link frame?
The access control information and logical topology
What is the purpose of the header and trailer in a data link frame?
To carry control information
What is the result of the CSMA/CA collision avoidance process?
Devices know how long the medium will be unavailable
Explore the key functions of the Data Link Layer in computer networks, including encapsulation, error detection, and frame control. Learn about the role of the Data Link Layer in facilitating communication between devices.
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