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ag-CCNA > 1 - Basic Networking > Flashcards

1 - Basic Networking Flashcards

1
Q

What IEEE standard number covers all Ethernet standards?

A

802.3

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2
Q

What suffixes are used for UTP cabling and Fiber cabling in informal IEEE Ethernet standard names?

A

T for UTP

X for Fiber

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3
Q

What are the IEEE standard and names for Ethernet and Fast Ethernet?

A

10BASE-T (802.3)

100BASE-T (802.3u)

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4
Q

What are the IEEE standard and names for both UTP and Fiber Gigabit Ethernet?

A

1000BASE-LX (802.3z) Fiber

1000BASE-T (802.3ab) UTP

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5
Q

What is the IEEE standard and name for 10 Gig Ethernet?

A

10GBASE-T (802.3an)

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6
Q

How many twisted pairs does 10BASE-T and 100BASE-T require?

A

2

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7
Q

How many twisted pairs does 1000BASE-T require?

A

4

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8
Q

Which twisted pair wire / pin numbers do Ethernet NICs and Routers use to transmit and receive on respectively?

A

Transmission on pins 1 and 2

Receive on pins 3 and 6

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9
Q

Which twisted pair wire / pin numbers do Switches use to transmit and receive on respectively?

A

Transmission on pairs 3 and 6

Receive on pins 1 and 2

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10
Q

What type of cable must be used to connect a PC NIC to a switch?

A

Straight through cable. (1-1, 2-2, 3-3, 6-6, etc)

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11
Q

What type of cable is used for connecting nodes that use opposite pairs for transmitting? e.g. PC NIC / Router to Switch?

A

Straight through cable

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12
Q

What type of cable must you use for connecting like devices that transmit on the same pins? e.g Hub, Switch to Switch (10 and 100 Mbps Ethernet)

A

Crossover cable

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13
Q

In 10BASE-T and 100BASE-T which types of devices transmit on Pins 1 and 2?

A

Routers, PC NICs and Wireless access points (Ethernet interface)

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14
Q

In 10BASE-T and 100BASE-T which two types of devices transmit on Pins 3 and 6?

A

Switches and Hubs

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15
Q

What is auto-mdix?

A

A feature on Switches that detects when the wrong cable is used and automatically changes the logic to make the link work

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16
Q

What are the layers of a Fiber Optic Cable?

A

Core, Cladding, Buffer, Strengthener, Outer jacket

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17
Q

What mode of Fiber allows for multiple angles (modes) of light entering the core? What type of transmitter is used?

A

Multimode. LED

18
Q

Which mode of fiber uses a smaller core with a transmitter sending light at one angle? What type of transmitter is used?

A

Single mode. Laser

19
Q

What is SFP/SFP+?

A

Small Form Pluggable, allow customer to change transceiver as module in Switches. E.g. switch to optical fiber ethernet

20
Q

What mode of Fiber is useful for very long distances?

A

Single mode

21
Q

List the following cable modes in order of least expensive to most expensive: Multi-mode fiber, UTP, Single-mode fiber?

A

UTP, Multi-mode, Single-mode

22
Q

What does Half Duplex mean for a device?

A

The device can only send when it is not receiving a frame i.e. it cannot send and receive a frame at the same time

23
Q

What does Full Duplex mean for a device?

A

A device can send and receive at the same time

24
Q

What layer of standards does a Hub use to forward data, and how does it do this?

A

Physical layer standards. A hub repeats electronic signals out all ports (except incoming)

25
Q

What is a big downside of LAN hubs?

A

If more than one device transmits at the same time, the signals collide and become messed up

26
Q

How does CSMA/CD work?

A

Sending device listens to link until its free. Sends a frame. If device detects a collision, all devices send a jamming signal, wait a random amount of time, then try again

27
Q

How many bytes are in an Ethernet FCS? Where is it located?

A

4 bytes. In the Ethernet Trailer

28
Q

How many bytes is the Ether Type field?

A

2 bytes

29
Q

What are the two most popular Data link layer protocols for leased lines between two routers?

A

HDLC (High level data link control) and PPP

30
Q

What is the Flag field in HDLC used for and whats its Ethernet equivalent?

A

Recognizable bit pattern so receivers know a new frame is arriving. Equivalent to Preamble, SFD

31
Q

What field is proprietary to each vendor in HDLC?

A

Type field

32
Q

What function does HDLC provide?

A

HDLC frames provide a way to encapsulate network layer packet correctly so it crosses the link between routers.

33
Q

What protocol is broadcast, multi access?

A

Ethernet

34
Q

What protocol is non broadcast, point to point?

A

HDLC

35
Q

Do Serial interfaces have MAC addresses? Why?

A

No. They do not need them. Serial interfaces are only used for Point to Point links

36
Q

What is an Ethernet Line Service (E-Line)?

A

Term for the point to point Ethernet WAN service

37
Q

What is Ethernet emulation?

A

A term highlighting a link is not a literal Ethernet link from end to end

38
Q

What is EoMPLS?

A

Ethernet over Multi Protocol Label Switching. Used to create Ethernet service. Acts as if it were a simple Ethernet link between two routers

39
Q

What port does DNS use?

A

53

40
Q

What port does TCP use?

A

57

41
Q

Do Optical cables suffer from EMI?

A

No

42
Q

What is macro-bending?

A

If a fiber-optic cable is bent too much, and it prevents the cable transmitting bits

ag-CCNA (21 decks)

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