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008 > OSI Model > Flashcards

OSI Model Flashcards

1
Q

Layer 6

A

Presentation Layer
-Transforms data between the format required for the network and the format required for the application.

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2
Q

Layer 7

A
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3
Q

Layer 5

A

Session Layer

-Represents functions that administer the process of establishing a dialog, managing data transfer, and then ending (or tearing down) the session.

-opening, closing, and maintaining connections between applications

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4
Q

Layer 2

A

Data Link Layer
-Responsible for transferring data between nodes on the same logical segment

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5
Q

What are the functions of a network protocol?

A

Addressing and encapsulation

-Addressing describes where data messages should go. At each layer, there are different mechanisms for identifying nodes and rules on how they can send and receive messages.

Encapsulation describes how the system should package data messages for transmission. Encapsulation is like an envelope for a letter, with the distinction that each layer requires its own envelope.

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6
Q

Private IP address range

A

192.168.0.0 - 192.168.255.255

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7
Q

MTU

A

Maximum Transmission Unit

-A limit on the maximum amount of data that can be transmitted over a network without fragmentation

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8
Q

In the OSI model, the layer 4 TCP PDU is known as:

A

Segment

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9
Q

In the OSI model, the layer 3 PDU is known as:

A

Packet

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10
Q

In the OSI model, the layer 2 PDU is called:

A

Frame

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11
Q

True or false? The DHCP server in the SOHO router assigns an IP address to the WAN interface automatically

A

False

The DHCP server in the SOHO router assigns IPadrresses to the hosts on the local network. The WAN address is likely to be assigned by DHCP, but a DHCP server is managed by the acces provider

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12
Q

How is the decimal value 171 expressed in hex?

A

0xAB

To work this out, divide 171 by 16 (10) and write the remainder (11) as the least significant hex digit (B). Note that the quotient 10 (the integer part of the sum, where 171/16-10.6875) is less than 16. Convert the quotient to hex (10=A) to derive the second hex digit and complete the conversion.

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13
Q

Data Link Layer Responsibility

A

Transferring data between nodes

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14
Q

Network Layer Responsibility

A

Logical network addressing and forwarding

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15
Q

Session Layer Responsibility

A

Provides services for applications that need to exchange multiple messages (dialog control)

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16
Q

Transport Layer Responsibility

A

Transforms data between the formats used by the network and applications

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17
Q

Application Layer Responsibility

A

Providing support to applications requiring network services (file transfer, printing, email, databases, and so on)

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18
Q

What fiber optic connector has a push/pull mechanism?

A

Subscriber Connector

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19
Q

What fiber optic connector has a bayonet-style coupling mechanism?

A

Straight Tip Connector

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20
Q

What fiber optic connectors is a duplex connector?

A

MT-RJ

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21
Q

What is Fast Link Pulse?

A

Sends link integrity test signals

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22
Q

Cable crimper

A

Creates a patch cord that fixes a plug to a cable

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23
Q

Block tool

A

Terminates a group of connectors in one action

24
Q

Punchdown Tool

A

Terminates a fixated cable and fixes conductors into an IDC

25
Q

Fusion Splicer

A

Tool for joining strands of fiber optic cable with minimal signal loss

26
Q

802.3

A

Ethernet standard

27
Q

802.11

A

Wifi standard

28
Q

What connectors are used to terminate Cat 7 cabling?

A

TERA and GG45

29
Q

A network technician needs a cost-effective solution that can multiplex up to 16 wavelengths on an SFP/SFP+ interface. Which multiplexing technique should the network technician use?

A

CWDM
Coarse Wavelength Division Multiplexing

Supports up to 16 wavelengths and typically deploys four or eight bidirectional channels over a single fiber strand

30
Q

Cat 5 vs Cat 5e

31
Q

Cat 6 vs Cat 6a

32
Q

What is part of the CSMA/CD protocol to identify collisions early?

A

Preamble & SFD

Preamble is for clock synchronization

SFD (Start Frame Delimiter) also used for clock synchronization

33
Q

What part of the Mac address identifies the vendor?

A

OUI
First six hex digits
(First 3 octets)

34
Q

What are the steps of the troubleshooting method?

35
Q

A security analyst is revieiwing various subnets that are set aside for various purposes. What is the subnet 192.0.2.0/24 and 198.51.100.0/24 se aside for?

A

Documentation and examples

36
Q

ipconfig /release

A

Releases IP address obtained from DHCP server that the interface will no longer have an IP address

37
Q

ipconfig /flushdns

A

Clears the DNS resolver cache

38
Q

ipconfig /all

A

Displays complete TCP/IP configuration parameters for each interface, including DHCP

39
Q

ipconfig /renew

A

Forces a DHCP client to renew the lease it ahs for an IP address.

40
Q

802.11a

A

5GHz
54 Mbit/s

41
Q

802.11b

A

2.4GHZ
11 Mbit/s

42
Q

802.11g

A

2.4GHz
54 Mbit/s

43
Q

802.11n

A

Wi-Fi 4
2.4 or 5 GHz
600 Mbit/s

MIMO

44
Q

802.11ac

A

Wi-Fi 5
5GHz

MU-MIMO

45
Q

802.11ax

A

Wi-Fi 6
2.4 and/or 5 GHz

46
Q

Cable crimper

A

Pinch the connector onto the wire

Ex: Places RJ 45 connector onto wire. Metal prongs push through the insulation

47
Q

Punch-down Tool

A

Forces wire into a wiring block

Trims the wires and breaks the insulation

48
Q

Tone Generator

A

Puts an analog sound on the wire to help find where the wire is

49
Q

Loopback Plug

A

For testing physical ports

50
Q

TDR / OTDR

A

Estimate fiber lengths
Measure signal loss
Determine light reflection

51
Q

Multimeter

A

AC/DC voltage reader

52
Q

ping

A

Test reachability

53
Q

ping -t

A

Ping until stopped with CTRL C

54
Q

ping -a

A

Resolve address to a hostname

008 (6 decks)

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