Cisco Chapter 4 - Network Access

Front 1

Name 7 layers of OSI model

Back 1

1. Application
2. Presentation
3. Session
4. Transport
5. Network
6. Data Link
7. Physical
   

Front 2

Name the 4 TCP/IP layers

Back 2

1. Application
2. Transport
3. Internet
4. Network Access
   

Front 3

Name 3 basic forms of physical media

Back 3

1. Copper Cabling
2. Fiber Optics
3. Wireless
   

Front 4

Name 2 forms of signaling in the physical layer

Back 4

Asynchronous: Data signals are transmitted without an associated clock signal.

Synchronous: Data signals are sent along with a clock signal which occurs at evenly spaced time durations referred to as the bit time.

Front 5

Why do networks use copper cabling?

Back 5

1. Cheap
2. Easy to install
3. Low resistance to electrical current
   

Front 6

What is copper cabling limited to?

Back 6

1. Distance
2. Signal interference
   

Front 7

Name 2 forms of electrical interference copper cable is susceptible to

Back 7

1. Electromagnetic interference (EMI) or radio frequencyinterference (RFI) - EMI and RFI signals can distort and corruptthe data signals being carried by copper media.
   
   
2. Crosstalk - Crosstalk is a disturbance caused by theelectric or magnetic fields of a signal on one wire to the signal inan adjacent wire.

Front 8

How can you reduce electrical noise on copper cabling

Back 8

1. Choose an suitable networking environment
   
   
2. Designing cable infrastucture to avoid interference in building structure
   
   
3. Using cabling techniques that include proper handling an termination of cables
   

Front 9

Name 3 types of copper cabling

Back 9

• Unshielded Twisted-Pair (UTP)
• Shielded Twisted-Pair (STP)
• Coaxial

Front 10

The new ethernet 10Gb standard uses this form of copper media

Back 10

STP

Front 11

Which copper cabling attaches antennas to wireless devices?

Back 11

Coaxial copper cabling

Front 12

Which copper cabling counters EMI and RFI by using shielding techniques and special connectors?

Back 12

STP

Front 13

What is the most common network media?

Back 13

UTP

Front 14

Which copper cabling terminates with BNC, N-type and F-type connectors?

Back 14

Coaxial

Front 15

How many pairs of wires does a UTP have?

Back 15

4

Front 16

UTP cable does not use shielding to counter the effects of EMI andRFI. Instead, cable designers have discovered that they can limit thenegative effect of crosstalk by...

Back 16

Cancellation - wires are pairedin a circuit. When two wires in an electrical circuit are placed close together, their magnetic fields are the exact opposite of each other. Therefore, the two magnetic fields cancel each other out and also cancel out any outside EMI and RFI signals.

Varying the number of twists per wire pair- To further enhance the cancellation effect of paired circuit wires designers vary the number of twists of each wire pair in a cable.

Front 17

What is category 3 (UTP) cabling used for?

Back 17

• Voice communication
• Phone lines
  

Front 18

Supported speeds of Cat 5 and 5e (UTP)

Back 18

Cat 5 = 100Mb/s

Cat5e = 1000Mb/s

Front 19

Supported speeds of Cat 6 (UTP)

Back 19

1000Mb/s to 10Gb/s

Front 20

What standards describes the wire color codes to pin assignments (pinouts) for Ethernet cables.

Back 20

TIA/EIA 568 standard

Front 21

What type of ethernet cable is commonly used to interconnect a host to a switch and a switchto a router.

Back 21

Straight through

(Both ends 568A or 568B)

Front 22

What type of ethernet cable is used to connect similar devices together?

Back 22

Crossover cable

(Different ends - one end 568A, other 568B)

Front 23

A Cisco proprietary cable used to connect to a router or switchconsole port.

Back 23

Rollover cable

Front 24

After installation, a UTP cable tester should be used to test for the following parameters:

Back 24

• Wire map
• Cable length
• Signal loss due to attenuatiom
• Crosstalk

Front 25

Cable colours on 568A standard

Back 25

1. Green/White
2. Green
3. Orange/White
4. Blue
5. Blue/White
6. Orange
7. Brown/White
8. Brown
   

Front 26

Cable colours on 568B standard

Back 26

1. Orange/White
2. Orange
3. Green/White
   
4. Blue
5. Blue/White
6. Green
7. Brown/White
8. Brown
   

Front 27

Name 5 components in a fiber optic cable

Back 27

1. Core
2. Cladding
3. Buffer
4. Strengthening material
5. Jacket
   

Front 28

Name 2 types of fibre optic cables

Back 28

Single-mode fibre (SMF) - Smaller Core, uses laser technology to send a single ray of light

Multi-mode Fibre (MMF) - Larger Core, users LED at different angles. Popular in LANs. It provides bandwidth up to 10 Gb/s over link lengths of up to 550 meters.

Front 29

What is the bandwidth and link lengths of a Multi Mode Fibre optic cable (MMF) ?

Back 29

Up to 10Gb/s

Up to 550 meters

Front 30

Name the three most popular network fiber-optic connectors

Back 30

Straight-tip (ST)

Subscriber Connector (SC)

Lucent Connector (LC)

Front 31

Three common types of fiber-optic termination and splicing errorsare:

Back 31

1. Misalignment: The fiber-optic media are not precisely aligned to one another when joined.
2. End gap: The media does not completely touch at the splice or connection.
3. End finish: The media ends are not well polished or dirt is present at the termination.

Front 32

What device can be used to test fiber optic cable?

Back 32

An Optical Time Domain Reflectometer (OTDR) can be used to test each fiber-optic cable segment.

Front 33

What concerns does wireless networking have?

Back 33

• Coverage
• Interference
• Security
  

Front 34

3 common data communications standards that apply to wirelessmedia are

Back 34

• Standard IEEE 802.11: Wireless LAN (WLAN) technology
• Standard IEEE 802.15: Wireless Personal Area Network (WPAN)standard, commonly known as "Bluetooth"
• Standard IEEE 802.16: Commonly known as Worldwide Interoperability for Microwave Access (WiMAX), uses a point-to-multipoint topology to provide wireless broadband access.

Front 35

Name 6 Wireless 802.11 standards

Back 35

1. 802.11a – 54mb/s, 5 GHz
2. 802.11b – 11mb/s, 2.4GHz
3. 802.11g – 54mb/s, 2.4 GHz
4. 802.11n – 600mb/s, 2.4GHz and 5 GHz
5. 802.11ac – 1 Gb/s, 5 Ghz
6. 802.11ad – 7Gb/s, 2.4 GHz, 5 Ghz and 60 Ghz

Front 36

What speeds and distance does 802.15 (Bluetooth) support?

Back 36

3 Mb/s

100 meters

Front 37

What speeds does 802.16 support

Back 37

1 Gb/s

Front 38

The data link layer performs these two basic services:

Back 38

• It accepts Layer 3 packets and packages them into data units called frames.
  
  
• It controls media access control and performs error detection.

Front 39

The data link layer is actually divided into two sublayers

Back 39

• Logical Link Control (LLC)
• Media Access Control
  

Front 40

What does the Logical Link Control (LLC) sub layer do?

Back 40

The LLC sublayer handles:

• error control
• flow control
• framing
• MAC-sublayer addressing.
  

Front 41

What is included in a data link frame?

Back 41

• Header
• Data
• Trailer
  

Front 42

LANand WAN topologies can be viewed in two ways:

Back 42

• Physical
• Logical
  

Front 43

Name 3 WAN physical topologies

Back 43

• Point to point
• Hub and spoke
• Mesh
  

Front 44

Name 4 physical LAN topologies

Back 44

• Star
• Extended star
• Bus
• Ring
  

Front 45

Name 2basic media access control methods for shared media

Back 45

• Contention-based access: All nodes compete for the use of the medium but have a plan if there are collisions.
  
• Controlled access: Each node has its own time to use the medium. Figure 2 shows controlled access.