459592
Pregunta 1
Pregunta
What is Ethernet ? (Choose two)
Respuesta
-
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
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Ethernet is a contention based media access method that allows all hosts on a network to share the same bandwidth of a link.
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Ethernet is a access method that provides end to end delivery during network services.
Pregunta 2
Pregunta
What is a collision domain?
Respuesta
-
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.
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A collision domain is a feature where a device fails to send a packet to the network and tries to resend the packet.
Pregunta 3
Pregunta
What is a broadcast domain?
Respuesta
-
Its part of a network technology that provides broadcasts for all hosts connected to the internetwork.
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This refers to a group of devices on a network segment that hear all the broadcasts sent on that network segment.
Pregunta 4
Pregunta
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.
Respuesta
- True
- False
Pregunta 5
Pregunta
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)
Respuesta
-
A jam signal informs all devices that a collision occurred.
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The collision triggers a random back off algorithm.
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The signal provides the devices to generate an inquiry file log.
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Each device on the segment stops transmitting for a short time until their backoff timers expire.
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All hosts have equal priority to transmit after the timers have expired.
Pregunta 6
Pregunta
What is the difference between Half Duplex and Full Duplex Ethernet?
Respuesta
-
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.
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Full Duplex uses one pair on the network cable wire with a signal running in both directions which offers a collision free network segment.
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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.
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Full Duplex uses two pairs on the network cable wire with a signal running in both directions which offers a collision free network segment.
Pregunta 7
Pregunta
Full Duplex Ethernet can run on Hub device environments
Respuesta
- True
- False
Pregunta 8
Pregunta
Full Duplex mode requires a dedicated switch port and a host network card that is capable of Full Duplex mode .
Respuesta
- True
- False
Pregunta 9
Pregunta
Ethernet at the Data Link layer is responsible for Ethernet addressing that is commonly referred to as ______________ addressing or _____________ addressing.
Respuesta
-
Logical
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Hardware
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MAC
Pregunta 10
Pregunta
In the Data Link layer there are four different types of Ethernet frames.
Respuesta
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Ethernet_II
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IEEE 802.3
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Media Access Control (MAC)
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Sub Network Access Protocol (SNAP)
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IEEE 802.2
Pregunta 11
Pregunta
Ethernet_II frame is the most commonly used
Respuesta
- True
- False
Pregunta 12
Pregunta
For Ethernet what is the most commonly used frame?
Respuesta
-
Sub Network Access Protocol (SNAP)
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Ethernet_II
Pregunta 13
Pregunta
For wireless specifications what is the most commonly used frame?
Respuesta
-
Sub Network Access Protocol (SNAP)
-
Ethernet_II
Pregunta 14
Pregunta
What makes up Ethernet Addressing ?
Respuesta
-
It uses Media Access Control (MAC) which is a sublayer of the Data Link Layer
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The MAC is a 48 bit (6 byte) address burned into every Ethernet network interface card (NIC) but it can be overridden.
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It uses Media Access Control (MAC) which is a sublayer of the Physical Layer
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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.
Pregunta 15
Pregunta
What are the values of a nibble and a byte in binary numbering?
Respuesta
-
A nibble is 8 bits with the value of each bit are the following: 128 64 32 16 8 4 2 1
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A byte is 8 bits with the value of each bit are the following: 128 64 32 16 8 4 2 1
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A byte is 4 bits with the value of each bit are the following: 8 4 2 1
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A nibble is 4 bits with the value of each bit are the following: 8 4 2 1
Pregunta 16
Pregunta
Each hex character has a value of one _______ and every two hex characters has the value of one _____
Respuesta
-
Each hex character has a value of one byte (8 bits) and every two hex characters has the value of one nibble (4 bits).
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Each hex character has a value of one nibble (4 bits) and every two characters has the value of one byte (8 bits).
Pregunta 17
Pregunta
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
Respuesta
- True
- False
Pregunta 18
Pregunta
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
Respuesta
- True
- False
Pregunta 19
Pregunta
The Data Link layer is responsible for combining bits into bytes and bytes into frames.
Respuesta
- True
- False
Pregunta 20
Pregunta
What are the three types of media access methods for Ethernet networks?
Respuesta
-
Contention (Ethernet)
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CSMA/CD (Carrier Sense Multiple Access/Collision Detection
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Polling (IBM Mainframes)
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Token Passing (Token Ring and Fiber Distributed Data Interface - FDDI)
Pregunta 21
Pregunta
Encapsulating a frame within a different type of frame is called Tunneling.
Respuesta
- True
- False
Pregunta 22
Pregunta
The Ethernet_II frame contains what field that is used to identify the network upper layer protocol.
Respuesta
-
Type field
-
Length field
Pregunta 23
Pregunta
SNAP frame has its own protocol field to identify the upper-layer protocol. How can you identify a SNAP Frame?
Respuesta
-
SNAP frame contains a field that is identified by Ethernet by its header.
-
SNAP frame has the DSAP and SSAP fields are always AA
Pregunta 24
Pregunta
Name the different types of Ethernet Cabling. (Choose three)
Respuesta
-
Fiber Optical Cabling (SC/LC)
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Straight-through Cabling
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Cross-over cabling
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Rolled Cabling
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CAT5 Cabling
Pregunta 25
Pregunta
Straight-Through cables can connect to which devices?
Respuesta
-
Host to switch or hub
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Switch to Switch
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Hub to Hub
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Router to Switch or hub
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Hub to Switch
-
Router direct to host
Pregunta 26
Pregunta
Crossover cables connect to what devices?
Respuesta
-
Host to switch or hub
-
Switch to Switch
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Host to Host
-
Hub to Hub
-
Router direct to host
-
Router to switch or hub
-
Switch to hub
Pregunta 27
Pregunta
Cross-over cabling connects to what cable pins?
Respuesta
-
1 to 1 , 2 to 2, 3 to 3, 6 to 6 (uses two pairs)
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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)
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1 to 3, 2 to 6 (uses only two pairs)
Pregunta 28
Pregunta
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)
Respuesta
- True
- False
Pregunta 29
Pregunta
What specific name for the PDU at the Transport layer?
Respuesta
-
Bits
-
Frames
-
Segments
-
Packets
Pregunta 30
Pregunta
What is the specific PDU name for the Data Link Layer?
Respuesta
-
Segment
-
Frames
-
Bits
-
Packets
Pregunta 31
Pregunta
What is the specific PDU name for the Network Layer?
Respuesta
-
Segment
-
Packet
-
Bits
-
Frames
Pregunta 32
Pregunta
What is the specific PDU name for the Physical Layer?
Respuesta
-
Segment
-
Frame
-
Bits
-
Packets
Pregunta 33
Pregunta
The Transport layer when using TCP, it takes the data stream and makes segments and establishes a __________ circuit.
Respuesta
-
physical
-
virtual
Pregunta 34
Pregunta
When TCP completes the virtual circuit session, its defined by the _______ and _________ port numbers.
Respuesta
-
high and well known
-
Source and Destination
Pregunta 35
Pregunta
In the Transport Layer, along with the Virtual Circuit session, the source and destination IP address is defined and called a __________.
Respuesta
-
Reliable session
-
Socket
Pregunta 36
Pregunta
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.
Respuesta
- True
- False
Pregunta 37
Pregunta
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.
Respuesta
-
ping (Packet Internetwork Grouper)
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ARP (Address Resolution Protocol)
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