問題一覧
1
What is a characteristic of CSMA/CD (Carrier Sense Multiple Access with Collision Detection), a media access control method commonly used in WAN environments?
It detects collisions and attempts to retransmit data
2
What are the main components of a Data Link Frame?
Header and Trailer
3
It refers to the primary characteristics of the Physical Layer in networking. Choose all that apply.
Provides modulation techniques., Performs error detection/correction mechanisms.
4
Which protocol operates at the Data Link Layer and is commonly used for local area networks (LANs)?
Ethernet
5
What is a key characteristic of CSMA/CA, a media access control method used in some WAN topologies?
It includes a mechanism for devices to request permission to transmit
6
It refers to one of the components of a fiber optic cable which provide protection and strength.
Buffer
7
It refers to a telecommunications technology aimed at providing wireless data over long distances in a variety of ways, from point-to-point links to full mobile cellular type access.
IEEE 802.16
8
It refers to one of the components of a fiber optic cable which carries the light signals.
Core
9
In Ethernet frames, what is the purpose of the EtherType field?
To indicate the type of data encapsulated in the payload.
10
Which media access control method uses a "listen before talk" approach, where devices check for the absence of a carrier signal before transmitting?
CSMA/CD
11
In CSMA/CD, what action do devices take if they detect a collision on the network?
They wait for a random time interval before attempting to retransmit.
12
What is the primary purpose of a Data Link Frame?
To encapsulate data at the Data Link Layer.
13
Which layer of the OSI model is responsible for managing Data Link Frames?
Data Link Layer
14
It refers to the encoding and modulation of digital data into physical signals suitable for transmission over the communication medium.
Signaling
15
It refers to a limitation of wireless media where WLANs operate in half-duplex mode.
Shared Medium
16
Which part of the Data Link Frame contains control information such as addressing and error checking?
Header
17
It refers to the primary function of the Physical Layer in the OSI model.
Transmits data over longer distances at higher bandwidth than any other networking media.
18
What is the significance of MAC (Media Access Control) addresses at the Data Link Layer?
They uniquely identify devices on a network
19
What is the purpose of the LLC (Logical Link Control) sublayer within the Data Link Layer?
To provide an interface between the Network Layer and the MAC sublayer
20
Which Data Link Frame field is responsible for ensuring that the data has not been corrupted during transmission?
Frame Check Sequence (FCS)
21
It refers to the main cable types that are obtained by using specific wiring conventions.
Ethernet straight-through and Ethernet crossover.
22
Which of the following protocols is commonly used for wireless LANs and operates at the Data Link Layer?
Wi-Fi (IEEE 802.11)
23
Which media access control method is often used in LAN technologies such as Token Ring?
Token Passing
24
Which media access control method is based on devices taking turns to transmit data, with each device having a predetermined order of access?
Polling
25
Which of the following functions is NOT typically performed by the Data Link Layer?
Fragmentation and reassembly of packets
26
What is the limitation of CSMA/CD in WAN environments compared to LAN environments?
It is less efficient in detecting collisions over long distances.
27
Which media access control method is commonly used in LAN technologies such as Ethernet?
CSMA/CD
28
It refers to the advantages of using copper cabling in networking compared to other transmission media. Choose all that apply.
Compatibility with existing infrastructure., Relatively low cost compared to alternatives like fiber optic cables.
29
In Ethernet frames, what is the purpose of the EtherType field?
It specifies the type of data link protocol used.
30
It refers to the type of information received from the Data Link layer and encoded as a series of signals that are transmitted to the local media.
Ethernet frame
31
Which media access control method is often used in WAN technologies such as Ethernet and relies on devices listening for a clear channel before transmitting?
CSMA/CD
32
It refers to the use of copper wires or cables to transmit data signals in networking.
Copper Cabling
33
What is a Data Link Frame?
A unit of data transmitted between devices at the Network Layer.
34
Which of the following is performed by the Physical Layer? Choose all that apply.
The physical layer sends data bits from one device(s) (like a computer) to another device(s)., The physical Layer defines the types of encoding., The physical Layer is responsible for the communication of the unstructured raw data streams over a physical medium.
35
It refers to a type of fiber optic cables which have a smaller core diameter and allow only one mode of light to propagate through the core.
Single mode fiber optic cables.
36
It is often referred to as the “Hardware Layer”, since it involves tangible physical components rather than abstract data features.
Physical layer
37
Which field in the Data Link Frame is used for error detection and correction?
Frame Check Sequence (FCS)
38
What is the purpose of the Header in a Data Link Frame?
To identify the source and destination devices.
39
Which media access control method is often employed in WAN environments and is based on a predetermined order in which devices can access the network?
Token passing
40
What is the function of the trailer in a Data Link Frame?
It provides error detection for the frame.
41
It refers to a type of cable which do not have additional shielding to protect against EMI and crosstalk
UTP Cables
42
In a Token Ring network, how is access to the network medium controlled?
A token is passed from device to device, allowing the holder to transmit data.
43
It refers to the longer the electrical signals have to travel, the weaker they get.
Attenuation
44
In a WAN environment utilizing TDMA, what is the primary mechanism for coordinating access to the shared medium?
Time slots are allocated to each device for exclusive use.
45
It refers to the advantages of using fiber optic cables in networking. Choose all that apply.
Low signal attenuation over long distances., Immunity to electromagnetic interference.
46
Which sublayer of the Data Link Layer is responsible for error detection and correction?
Media Access Control (MAC)
47
What is the primary purpose of the Data Link Layer in the OSI model?
To manage access to the physical medium and control the flow of data
48
Which media access control method is commonly used in WAN technologies such as Token Ring and FDDI (Fiber Distributed Data Interface)?
Token passing
49
What is a characteristic of CSMA/CA, another media access control method used in LAN environments?
It includes a mechanism for devices to request permission to transmit
50
It refers to the range of frequencies available for data transmission over a communication channel.
Bandwidth
51
Which field in the Data Link Frame is used for error detection?
Frame Check Sequence (FCS)
52
It refers to wireless standard where wireless AP and wireless NIC adapters are required to establish a connection with other devices in the network.
IEEE 802.11
53
It refers to a hardware component, typically a circuit board or chip, installed on a computer so it can connect to a network.
NIC
54
What is the function of the Footer in a Data Link Frame?
To mark the end of the frame.
55
Which of the following components is typically found in a Data Link Frame?
Header and Footer
56
It refers to mitigation strategies to address copper cabling limitations. Choose all that apply.
Strict adherence to cable length limits will mitigate attention., Some copper cables use metallic shielding and grounding.
57
It refers to the methods which help ensure the integrity and reliability of data transmission over the communication medium.
Error detection/correction mechanisms
58
It refers to the physical channels through which data signals are transmitted, including copper wires, fiber optic cables, and wireless communication channels.
Transmission media.Transmission media.
59
It refers to a wireless standard where WLAN technology is also known as Wi-Fi.
IEEE 802.11
60
It refers to a type of cable which relies on electrical signals, and transmit data using light.
Fiber Optic Cable