問題一覧
1
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.
2
It is often referred to as the “Hardware Layer”, since it involves tangible physical components rather than abstract data features.
Physical layer
3
It refers to a hardware component, typically a circuit board or chip, installed on a computer so it can connect to a network.
NIC
4
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
5
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.
6
It refers to the primary characteristics of the Physical Layer in networking. Choose all that apply.
Provides modulation techniques., Performs error detection/correction mechanisms.
7
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.
8
It refers to the encoding and modulation of digital data into physical signals suitable for transmission over the communication medium.
Signaling
9
It refers to the methods which help ensure the integrity and reliability of data transmission over the communication medium.
Error detection/correction mechanisms
10
It refers to the range of frequencies available for data transmission over a communication channel.
Bandwidth
11
It refers to the use of copper wires or cables to transmit data signals in networking.
Copper Cabling
12
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.
13
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.
14
It refers to the longer the electrical signals have to travel, the weaker they get.
Attenuation
15
It refers to a type of cable which do not have additional shielding to protect against EMI and crosstalk
UTP Cables
16
It refers to a type of cable which relies on electrical signals, and transmit data using light.
Fiber Optic Cable
17
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.
18
It refers to one of the components of a fiber optic cable which carries the light signals.
Core
19
It refers to one of the components of a fiber optic cable which provide protection and strength.
Buffer
20
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.
21
It refers to a limitation of wireless media where WLANs operate in half-duplex mode.
Shared Medium
22
It refers to a wireless standard where WLAN technology is also known as Wi-Fi.
IEEE 802.11
23
It refers to the main cable types that are obtained by using specific wiring conventions.
Ethernet straight-through and Ethernet crossover.
24
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
25
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
26
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
27
Which of the following functions is NOT typically performed by the Data Link Layer?
Fragmentation and reassembly of packets
28
Which protocol operates at the Data Link Layer and is commonly used for local area networks (LANs)?
Ethernet
29
What is the significance of MAC (Media Access Control) addresses at the Data Link Layer?
They uniquely identify devices on a network
30
Which sublayer of the Data Link Layer is responsible for error detection and correction?
Media Access Control (MAC)
31
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
32
Which of the following protocols is commonly used for wireless LANs and operates at the Data Link Layer?
Wi-Fi (IEEE 802.11)
33
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
34
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
35
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
36
Which media access control method is commonly used in WAN technologies such as Token Ring and FDDI (Fiber Distributed Data Interface)?
Token passing
37
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.
38
What is the limitation of CSMA/CD in WAN environments compared to LAN environments?
It is less efficient in detecting collisions over long distances.
39
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
40
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
41
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.
42
Which media access control method is commonly used in LAN technologies such as Ethernet?
CSMA/CD
43
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
44
Which media access control method is often used in LAN technologies such as Token Ring?
Token Passing
45
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.
46
Which media access control method is based on devices taking turns to transmit data, with each device having a predetermined order of access?
Polling
47
What is a Data Link Frame?
A unit of data transmitted between devices at the Network Layer.
48
Which of the following components is typically found in a Data Link Frame?
Header and Footer
49
What is the purpose of the Header in a Data Link Frame?
To identify the source and destination devices.
50
Which field in the Data Link Frame is used for error detection?
Frame Check Sequence (FCS)
51
In Ethernet frames, what is the purpose of the EtherType field?
To indicate the type of data encapsulated in the payload.
52
What is the function of the Footer in a Data Link Frame?
To mark the end of the frame.
53
Which Data Link Frame field is responsible for ensuring that the data has not been corrupted during transmission?
Frame Check Sequence (FCS)
54
What is the primary purpose of a Data Link Frame?
To encapsulate data at the Data Link Layer.
55
Which layer of the OSI model is responsible for managing Data Link Frames?
Data Link Layer
56
What are the main components of a Data Link Frame?
Header and Trailer
57
Which part of the Data Link Frame contains control information such as addressing and error checking?
Header
58
In Ethernet frames, what is the purpose of the EtherType field?
It specifies the type of data link protocol used.
59
What is the function of the trailer in a Data Link Frame?
It provides error detection for the frame.
60
Which field in the Data Link Frame is used for error detection and correction?
Frame Check Sequence (FCS)