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Ethernet Networks In Review - Chapter 3

Descrição

Understanding LANs in the perspective of Ethernet Technologies
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Quiz por sirhulk1, atualizado more than 1 year ago
sirhulk1
Criado por sirhulk1 mais de 10 anos atrás
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Resumo de Recurso

Questão 1

Questão
What is Ethernet ? (Choose two)
Responda
  • Ethernet is a trademark for a family of Ethernet technologies for Local Area Networks (LANs) was introduced in 1980 and standardized in 1985 as IEEE 802.3
  • Ethernet is a contention based media access method that allows all hosts on a network to share the same bandwidth of a link.
  • Ethernet is a access method that provides end to end delivery during network services.

Questão 2

Questão
What is a collision domain?
Responda
  • This is an Ethernet term describing two devices on one physical segment both sends out a packet at the same time. This will result in a collision and forcing both devices to retransmit at a later time. A collision domain is typically found in a Hub network environment.
  • A collision domain is a feature where a device fails to send a packet to the network and tries to resend the packet.

Questão 3

Questão
What is a broadcast domain?
Responda
  • Its part of a network technology that provides broadcasts for all hosts connected to the internetwork.
  • This refers to a group of devices on a network segment that hear all the broadcasts sent on that network segment.

Questão 4

Questão
Carrier Sense Multiple Access w/collision detection (CSMA/CD) is a protocol that helps devices share the bandwidth evenly without having two devices transmit at the same time on the network medium.
Responda
  • True
  • False

Questão 5

Questão
When two devices send out a packet at the same time on the same segment causing a collision, how does CSMA/CD act on resolving this? (Choose four)
Responda
  • A jam signal informs all devices that a collision occurred.
  • The collision triggers a random back off algorithm.
  • The signal provides the devices to generate an inquiry file log.
  • Each device on the segment stops transmitting for a short time until their backoff timers expire.
  • All hosts have equal priority to transmit after the timers have expired.

Questão 6

Questão
What is the difference between Half Duplex and Full Duplex Ethernet?
Responda
  • Half Duplex uses just one pair on the network cable wire with a signal running in both directions. It also uses CSMA/CD protocol to help detect and prevent collisions. Half Duplex is typically run on hub environments.
  • Full Duplex uses one pair on the network cable wire with a signal running in both directions which offers a collision free network segment.
  • Half Duplex uses two pairs on the network cable wire with a signal running in both directions which is a collision free network segment. Half Duplex is typically run on hub environments.
  • Full Duplex uses two pairs on the network cable wire with a signal running in both directions which offers a collision free network segment.

Questão 7

Questão
Full Duplex Ethernet can run on Hub device environments
Responda
  • True
  • False

Questão 8

Questão
Full Duplex mode requires a dedicated switch port and a host network card that is capable of Full Duplex mode .
Responda
  • True
  • False

Questão 9

Questão
Ethernet at the Data Link layer is responsible for Ethernet addressing that is commonly referred to as ______________ addressing or _____________ addressing.
Responda
  • Logical
  • Hardware
  • MAC

Questão 10

Questão
In the Data Link layer there are four different types of Ethernet frames.
Responda
  • Ethernet_II
  • IEEE 802.3
  • Media Access Control (MAC)
  • Sub Network Access Protocol (SNAP)
  • IEEE 802.2

Questão 11

Questão
Ethernet_II frame is the most commonly used
Responda
  • True
  • False

Questão 12

Questão
For Ethernet what is the most commonly used frame?
Responda
  • Sub Network Access Protocol (SNAP)
  • Ethernet_II

Questão 13

Questão
For wireless specifications what is the most commonly used frame?
Responda
  • Sub Network Access Protocol (SNAP)
  • Ethernet_II

Questão 14

Questão
What makes up Ethernet Addressing ?
Responda
  • It uses Media Access Control (MAC) which is a sublayer of the Data Link Layer
  • The MAC is a 48 bit (6 byte) address burned into every Ethernet network interface card (NIC) but it can be overridden.
  • It uses Media Access Control (MAC) which is a sublayer of the Physical Layer
  • The MAC address is divided into two parts, first 24 bits is called the Organizational Unit Identifier (OUI) and the second 24 bits are Vendor assigned.

Questão 15

Questão
What are the values of a nibble and a byte in binary numbering?
Responda
  • A nibble is 8 bits with the value of each bit are the following: 128 64 32 16 8 4 2 1
  • A byte is 8 bits with the value of each bit are the following: 128 64 32 16 8 4 2 1
  • A byte is 4 bits with the value of each bit are the following: 8 4 2 1
  • A nibble is 4 bits with the value of each bit are the following: 8 4 2 1

Questão 16

Questão
Each hex character has a value of one _______ and every two hex characters has the value of one _____
Responda
  • Each hex character has a value of one byte (8 bits) and every two hex characters has the value of one nibble (4 bits).
  • Each hex character has a value of one nibble (4 bits) and every two characters has the value of one byte (8 bits).

Questão 17

Questão
In order to convert a hex value to a decimal value, you must first convert hex into binary, then add the binary values that will result in the decimal value. Example: 0xC84 => 1100 1000 0100 => 2048 + 1024 + 128 + 4 => 3204
Responda
  • True
  • False

Questão 18

Questão
In order to convert binary to hex, you must first break the 8 bit binary into two 4 bit nibbles, then add up each nibble value separately which will result in the hex value. Example: 01010101 => 0101 => 5 and 0101 => 5 , now add the two nibble values separately in hex format using "0x" => 0x55
Responda
  • True
  • False

Questão 19

Questão
The Data Link layer is responsible for combining bits into bytes and bytes into frames.
Responda
  • True
  • False

Questão 20

Questão
What are the three types of media access methods for Ethernet networks?
Responda
  • Contention (Ethernet)
  • CSMA/CD (Carrier Sense Multiple Access/Collision Detection
  • Polling (IBM Mainframes)
  • Token Passing (Token Ring and Fiber Distributed Data Interface - FDDI)

Questão 21

Questão
Encapsulating a frame within a different type of frame is called Tunneling.
Responda
  • True
  • False

Questão 22

Questão
The Ethernet_II frame contains what field that is used to identify the network upper layer protocol.
Responda
  • Type field
  • Length field

Questão 23

Questão
SNAP frame has its own protocol field to identify the upper-layer protocol. How can you identify a SNAP Frame?
Responda
  • SNAP frame contains a field that is identified by Ethernet by its header.
  • SNAP frame has the DSAP and SSAP fields are always AA

Questão 24

Questão
Name the different types of Ethernet Cabling. (Choose three)
Responda
  • Fiber Optical Cabling (SC/LC)
  • Straight-through Cabling
  • Cross-over cabling
  • Rolled Cabling
  • CAT5 Cabling

Questão 25

Questão
Straight-Through cables can connect to which devices?
Responda
  • Host to switch or hub
  • Switch to Switch
  • Hub to Hub
  • Router to Switch or hub
  • Hub to Switch
  • Router direct to host

Questão 26

Questão
Crossover cables connect to what devices?
Responda
  • Host to switch or hub
  • Switch to Switch
  • Host to Host
  • Hub to Hub
  • Router direct to host
  • Router to switch or hub
  • Switch to hub

Questão 27

Questão
Cross-over cabling connects to what cable pins?
Responda
  • 1 to 1 , 2 to 2, 3 to 3, 6 to 6 (uses two pairs)
  • 1 to 8, 2 to 7, 3 to 6, 4 to 5, 5 to 4, 6 to 3, 7 to 2, 8 to 1 (uses four pairs)
  • 1 to 3, 2 to 6 (uses only two pairs)

Questão 28

Questão
Data Encapsulation is data wrapped with protocol information that is created for each layer of the OSI model. To communicate and exchange information each layer uses Protocol Data Units (PDUs)
Responda
  • True
  • False

Questão 29

Questão
What specific name for the PDU at the Transport layer?
Responda
  • Bits
  • Frames
  • Segments
  • Packets

Questão 30

Questão
What is the specific PDU name for the Data Link Layer?
Responda
  • Segment
  • Frames
  • Bits
  • Packets

Questão 31

Questão
What is the specific PDU name for the Network Layer?
Responda
  • Segment
  • Packet
  • Bits
  • Frames

Questão 32

Questão
What is the specific PDU name for the Physical Layer?
Responda
  • Segment
  • Frame
  • Bits
  • Packets

Questão 33

Questão
The Transport layer when using TCP, it takes the data stream and makes segments and establishes a __________ circuit.
Responda
  • physical
  • virtual

Questão 34

Questão
When TCP completes the virtual circuit session, its defined by the _______ and _________ port numbers.
Responda
  • high and well known
  • Source and Destination

Questão 35

Questão
In the Transport Layer, along with the Virtual Circuit session, the source and destination IP address is defined and called a __________.
Responda
  • Reliable session
  • Socket

Questão 36

Questão
In TCP the destination port number represents the upper layer process (Application). As an example if the destination port was 23 that would be considered a telnet session needed for the receiving host.
Responda
  • True
  • False

Questão 37

Questão
The Network layer is responsible in finding the destination hardware address that will dictate where the packet will go on the local area network (LAN). It does this by sending an ________ request.
Responda
  • ping (Packet Internetwork Grouper)
  • ARP (Address Resolution Protocol)

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