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1 Network+ > Hardware, cables, topologies, transmission types > Flashcards

Hardware, cables, topologies, transmission types Flashcards

1
Q

What speed is 10GBASE-T and what are the wires made of?

A

10Gbit/s speed over twisted copper pairs.

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1
Q

What is the speed of 1000BASE-SX and what media does it use?

A

1Gbit/s FIBER connection. SX stands for Short Wavelength.

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2
Q

What type of light source does multi-mode fiber use?

A

LED is generally used for multi-mode fiber as its short range (up to 2km) and inexpensive.

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3
Q

Does single or multi mode fiber signal reach further?

A

Single-mode fiber technology travels a lot further (up to 100km) than multi-mode. Thanks in part to using a LAZER.

Single lazer beam.

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4
Q

What speed does twin axial (twinax) cable support and over what maximum distance?

A

Twin-axial Cable is low cost cable with lower latency than twisted copper pair cable with a maximum cable length of 5m.

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5
Q

What is a transceiver?

A

A transmitter and receiver of signals in a single component. E.g. an ethernet transceiver that you can plug into a switch port.

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6
Q

What does SFP stand for in an SFP Transceiver?

A

Small Form-factor Pluggable Transceiver - e.g. 1Gbit/s fiber or copper/RJ45.

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7
Q

What max. speed does an SFP+ transceiver support vs SFP?

A

SFP+ 16Gbit/s. SFP 1Gbit/s. Both transceivers are the same physical size/form factor.

SFP+ = Small Form-factor Pluggable Enhanced+

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8
Q

Does a Quad SFP (QFSP) have a bigger form factor than single SFP?

A

Yes, but only slightly, not 4x the size so it saves space.

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9
Q

What is the max. speed supported by a QSFP transceiver?

A

4x a single SFP so 4Gbit/s (SFP = 1Gbit/s).

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10
Q

Which has a bigger form-factor of LC (Local Connector) or SC (Subscriber Connector) fiber connectors?

A

LC (Little) is slightly smaller than SC (SCaled up) connector but both come in pairs and lock in with a clip.

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11
Q

What connector type does ST fiber connector use?

A

Straight Tip Fiber connector is a bayonet connector - which means you stick it in and twist it to lock in place.

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12
Q

How many individual fibres are contained within a single MPO fiber connector?

A

MPO - Multi-fiber Push On connector contains 12 fibers in one cable to save space. It clips into place.

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13
Q

What type of connection uses RJ11 connector?

A

Phoneline/DSL (Digital Subscriber Line) connection uses the RJ11 connector 6P2C (6 position, 2 conductor).

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14
Q

What type of connection has 8 positions and 8 conductors?

A

RJ45 has 8P8C - Ethernet.

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15
Q

What type of connector would you use with DOCSIS (Data Over Cable Service Interface Specification)?

A

F-connector, RJ6 cable, cable modem - TV and internet, screw in.
Or
BNC Connector, bayonet connector.

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16
Q

What is the most commonly used network topology type in big businesses?

A

Star/Hub and Spoke topology is the most frequently used. With an ethernet switch in the middle.

17
Q

What topology is based on multiple data paths between devices on the LAN to provide redundancy (and can load balance)?

A

Mesh topology - relies on multiple paths between network devices for redundancy and load balancing.

18
Q

What is a network topology called that consists of multiple different types of topology?

A

Hybrid Network Topology.

19
Q

In a spine and leaf topology what does and does not connect to what?

A

Spine switches connect to every leaf switch which then connect to end points/devices like PC’s. But spine switches do NOT connect directly to each other.

Broken spine.

20
Q

What are the 3 tiers of the 3-tier architecture?

A

Tier 1: Core (Servers, databases, critical stuff)
Tier 2: Distribution (switches)
Tier 3: Access (end users, printers, switches close to users, etc)

21
Q

In the collapsed core/two-tier network architecture model what layers of the 3-tier model get compressed into one tier?

A

Core and Distribution tiers are one tier in the collapsed core model.

This is a good model for smaller organizations, sacrifices some resiliency/redundancy for simpler implementation and lower cost to setup and maintain than the 3-Tier model.

22
Q

What is data ingress?

A

Ingress = data entering a system/network.

23
Q

What is data egress?

A

Data Exiting a network/system.

24
Q

Does an East to West data flow leave a data center?

A

No, East-West data flow moves across devices WITHIN a data center, therefore security is a much lesser concern than North-South flow which ingresses and egresses the data center.

25
Q

What is the name of a one-to-one data transfer directly between two systems only?

A

Unicast: one-to-one transmission from one point in the network to another point. E.g. web surfing, file transfers. Uses IPv4 or IPv6.

26
Q

What is a one to many delivery of data network communication called?

A

Multicast - where one source sends out data simultaneously to multiple other systems such as streaming to multiple users.

Requires good hardware.

27
Q

What is anycast?

A

Anycast is a communication from one to one OF many choices. It is sent (like a unicast) to the closest/optimal device of a bunch of devices on its network.

28
Q

What communication method sends data packet from one system to all other systems on the domain at once?

A

Broadcast - sends data from one device to all connected/subnet devices (broadcast domain) at once.

Like a hub. Used for routing updates, ARP requests.

Only works with IPv4.

29
Q

What is a Distribution Frame?

A

Distribution Frame = a structure where cables are connected terminated passively (as it doesn’t actively process or amplify signals) , e.g. a punch down block or patch panel. Usually mounted on a wall or flat surface.

30
Q

What is a MDF/Main Distribution Frame?

A

MDF = central hub for a buildings IT systems/cabling aka an IT closet.

31
Q

What is a PDU?

A

Power Distribution Unit (PDU) = provide multiple power outlets and are generally manageable and monitorable remotely.

32
Q

What would you use a visual fault locator for?

A

Visual fault locator - device to check the continuity/faults of a fibre optic cable - by shining a light down the cable that will shine out at any breaks in the fiber.

33
Q

What is the “show route” network device command used for?

A

show route = displays the routing table of the device which can be used to find errors in the routes it has stored (e.g. make sure that a static route has been inputted correctly).

34
Q

What does the “show interface” command show?

A

show interface = displays the current status of an interface, e.g. up, down, connected, duplex, speed, MTU size, encapsulation type, etc.

This allows you to identify problems with the interface like any CRC errors, drops, I/O errors.

35
Q

CLI command to view the current configuration of a device?

A

show config = shows the device settings (requires specific device syntax understanding/knowledge).

36
Q

How would you see what VLAN/s are associated with which switch interface?

A

Use the “show vlan” command.

37
Q

How to see how much power is being provided to a switch interface (PoE)?

A

show power = shows the power supply status, available/used and remaining power for an interface.

38
Q

What are DAC cables made up of and what do they do?

A

DAC (Direct Attach Copper) ethernet cables are made up of twinax/twinaxial shielded cables. And they are used to connect equipment ports such as switches/server/router ports together. They have transceivers on each end.

DAC has speeds of up to 40Gbps (QSFP+) Quad Small Form-factor Pluggable

39
Q

What’s a PDU for?

A

PDU - Power Distribution Unit - distributes power to various connected components (generally within a data center).

40
Q

What’s an IDF?

A

Intermediate Distribution Frame (IDF) is a mid point access frame (patch panel/cable management) between the MDF (Main Distribution Frame) and end users. Having IDF’s means that you don’t need to run a million long cable runs you just run a few between MDF and IDF and then end users can plug into the IDF close to them.

41
Q

In cabling what is Transposition?

A

Transposition = incorrectly connected wires, e.g. swapped wires - this reduces or even completely stops connectivity.

1 Network+ (11 decks)

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