NETWORK SYSTEMS DESIGN (ET0717) (Version 1)

SINGAPORE POLYTECHNIC ET0012
CHAPTER 2: NETWORKING BASICS

1. Network Interface Card (NIC) carries a unique code to control data communications for the host on a network. This code is known as:
(a) IP address.
(b) IP header.
(c) MAC address.
(d) ARP protocol.

2. A workstation that is logged into a file server is that server’s:
(a) resource.
(b) client.
(c) node.
(d) host.

3. Domain Name Server provides:
(a) MAC address translation.
(b) IP address translation.
(c) Physical address translation.
(d) Logical address translation.

4. Which one of the following indicates the number of layers in an Open System Interconnection (OSI)
model?
(a) 3
(b) 9
(c) 7
(d) 10

5. Give a definition of a network.
(a) A system to allow the user to make requests for information from the central computer.
(b) An organized way of storing information about a set of similar things.
(c) A system that receives data and messages enabling two or more computers to communicates.
(d) All the above.

6. What is a Local Area Network (LAN)?
(a) Network within a building or site.
(b) Network across a city, country or even the world.
(c) Network that contains servers across the world.
(d) A network that connects two different protocols together.

7. Default gateway is the default ________ address.
(a) PC
(b) Switch
(c) Hub
(d) Router

8. _____ cable can be used to connect two computers directly without using a hub or switch.
(a) Straight UTP
(b) Crossover UTP
(c) Rollover UTP
(d) None of the above

9. Which of the following is a characteristic of a hub
(a) It maintains address tables.
(b) It regenerates and repeats signals.
(c) It alleviates excessive traffic.
(d) It filters traffic on a LAN.


10. To construct a simple LAN of 4 computers you connect them with
(a) Cross-over cables
(b) Serial lines
(c) Hub
(d) Router

11. Which of the following is a characteristic of a switch
(a) A multi-port bridge to connect LAN segments.
(b) A multi-port repeater
(c) It sends data to all connected hosts.
(d) It uses IP address tables to transmit data.

12. Describe the function of the hub at the centre
(a) A device to store information.
(b) Hardware device which will enable any printer to be connected to the network.
(c) A central location for the attachment of cabling from a number of PCs.
(d) A hub is hardware used to connect two different protocols in a network.

13. Which network device is required if a hospital group wishes to connect its regional hospitals to the
headquarter.
(a) hub
(b) switch
(c) router
(d) gateway

14. Which of the following best describes the function of a broadcast address?
(a) It sends a message to a single network destination.
(b) It copies messages and sends them to specific network addresses.
(c) It sends a message to all nodes on a network.
(d) It sends a message to every node to which the router has access.

15. Internet Explorer Word communicates directly with which OSI layer?
(a) Application
(b) Presentation
(c) Session
(d) Transport

CHAPTER 3: STRUCTURED CABLING BASICS

1. The maximum horizontal cabling length based on cable length from the termination of the media at the horizontal cross-connect in the telecommunications room to the telecommunications outlet in the work area is
(a) 10 meters
(b) 80 meters
(c) 90 meters
(d) 100 meters

2. One of the early decisions you must make when planning your network is
(a) where to place the wiring closet(s)
(b) the number of horizontal cables needed
(c) the number of backbone cables needed
(d) the type of media to be used for the backbone cabling

3. Which of the followings is NOT recommended for backbone cabling in new installation
(a) 100ohm UTP
(b) 150ohm STP
(c) 50ohm coaxial cable
(d) Single-mode optical fiber

4. Which of the following is NOT desirable when selecting a wiring closet
(a) Room with a lighting switch placed immediately inside the door
(b) Room where no water or stream pipes runs through or above it
(c) Room with a dropped or false ceiling
(d) Room with tiled or some other type of finished surface

5. Which of the following statement is TRUE ?
(a) ICCs can be cascaded in a network.
(b) Backbone cabling must use single mode optical fibre.
(c) Coaxial cable is recommended by TIA/EIA for horizontal cabling.
(d) In a multi-storey building, each floor should have an IDF.

6. Which of the following is a structured cabling standard?
(a) ANSI/TIA/EIA-569-A
(b) 100BaseTX
(c) IEEE802.3ab
(d) RJ45

7. In a multi-storey building, the MDF should be put in ______ floor, if POP is not an issue.
(a) top
(b) ground
(c) middle
(d) every

8. Each ______ m2 area should have one wiring closet.
(a) 10
(b) 100
(c) 1000
(d) 10,000

9. Each HCC/IDF should reach the MDF through no more than ______ ICC.
(a) 1
(b) 2
(c) 3
(d) 4



CHAPTER 4: PHYSICAL MEDIA - Copper Cabling

1. What is the interference described by the diagram below?
     Fast Ethernet

(a) Near end crosstalk (NEXT)
(b) Far end cross talk
(c) Delay skew
(d) Return Loss

2. What is the interference described by the diagram below?
    Gigabit Ethernet: TX & RX simultaneously

(a) Near end crosstalk
(b) Far end cross talk
(c) Delay skew
(d) Return Loss

3. As a rule of thumb, the minimum bending radius of a copper cable should be ____ times of the
diameter.
(a) 4
(b) 5
(c) 10
(d) 15

4. Which of the following network parameter that fluctuates most and highly dependent on workmanship?
(a) Near End Crosstalk
(b) Return Loss
(c) Attenuation
(d) EMI

5. Time Domain Reflectors measure
(a) cable distance
(b) cable attentuation
(c) NEXT
(d) return loss


CHAPTER 4: PHYSICAL MEDIA - Fiber Cabling

1. The bandwidth in fibre is influenced by
(a) Light source
(b) Fibre properties
(c) Both light source and fibre properties
(d) None of the above

2. Graded index fibre
(a) Increases the bandwidth
(b) Increases attenuation
(c) Increases wavelength
(d) Increases numerical aperture

3. Which of the following fibre has higher bandwidth
(a) Single mode
(b) Multi mode
(c) Binary mode
(d) Tetra mode

4. Bit rate for fiber is dependent on
(a) Signal frequency
(b) Pulse frequency
(c) Signal amplitude
(d) Pulse bandwidth

5. In the case of graded index fibre, the refractive index of the ______ is changing gradually from the
centre to the edge.
(a) coating
(b) cladding
(c) core
(d) core and cladding

6. Which of the following fibre is preferred for long distance applications?
(a) Single mode
(b) Multi mode
(c) Binary mode
(d) Tetra mode

7. Which of the following optical transmitter has lowest cost
(a) LED
(b) VCSEL
(c) Laser
(d) Photon

8. Which of the following optical transmitter has the highest data rate.
(a) LED
(b) VCSEL
(c) Laser
(d) Photon

9. Modal dispersion refers to the ________ of signal wavelength
(a) widening
(b) narrowing
(c) constant value
(d) disappearance




CHAPTER 5: ETHERNET

1. Signal/Noise Ratio is more crucial for signals with __________ levels of coding?
(a) higher
(b) lower
(c) aligning
(d) flat

2. In order to implement 1000Mbps full-duplex over UTP, special transceiver is required to
(a) cancel out near-end-crosstalk and return loss
(b) overcome reflection
(c) improve NEXT
(d) reduce attenuation

3. The 1000BaseT is a specification for Gigabit Ethernet transmitting data at __ Mbps over a pair of
UTP copper cable. (Please read carefully!)
(a) 100
(b) 125
(c) 250
(d) 1000

4. 1000BaseLX consists of the following type/types:
(a) STP and UTP
(b) Multi-mode only
(c) Single-mode only
(d) Multi-mode and Single-mode

5. Which of the following may NOT need Gigabit Ethernet? (Please read carefully!)
(a) High-resolution graphics, video and other rich media types that exceed the capacity of even Fast Ethernet
(b) Internet and Intranet applications create unpredictable one-to-one traffic patterns
(c) Internet and Intranet applications create unpredictable any-to-any traffic patterns
(d) Tremendous load on the network backbone where traffic aggregates.

6. Channels in Gigabit Ethernet must not have delay skew greater than
(a) 50 s
(b) 50 ms
(c) 50 μs
(d) 50 ns

7. The Gigabit Ethernet standard 1000BaseT utilizes Pulse Amplitude Modulation of ____ levels.
(a) 1
(b) 3
(c) 5
(d) 7

8. Which of the following is Physical Layer specification of Gigabit Ethernet Standard for UTP cable?
(a) 1000BaseSX
(b) 1000BaseCX
(c) 1000BaseLX
(d) 1000BaseT

9. The 1000BASE-T is a specification for Gigabit Ethernet over _______ pairs of UTP copper cable.
(a) 2
(b) 4
(c) 8
(d) 10


Quiz1 4A Copper Cabling

Question 1
In a multi-storey building, the MDF should be put in ______ floor, if POP is not an issue.a) top
b) ground
c) middle
d) every

Question 2
Each ______ m2 area should have one wiring closet.
a) 10
b) 100
c) 1000
d) 10,000

Question 3
What is the minimum number of telecommunications outlet(s) required for each individual work area?
a) 1
b) 2
c) 3
d) 4

Question 4
All stations in a network are connected to the wiring closet in _____________ topology.
a) mesh
b) star
c) bus
d) ring

Question 5
How many layers are there in the Open System Interconnection (OSI) model?
a) 3
b) 9
c) 7
d) 10

Question 6
The default gateway is usually the IP address of a _______.
a) computer
b) switch
c) hub
d) router

Question 7
To connect a remote office located in Jurong to the head office located in Woodlands, you need _______.
a) a long straight cable
b) a hub
c) a switch
d) a router

Question 8
Match the following to their correct layers based on the OSI model.

Hub
Router
Switch
Repeater

A. Layer 2
B. Layer 1
C. Layer 3

Answer: Hub, Repeater (Layer 1)
Answer: Switch (Layer 2)
Answer: Router (Layer 3)

Question 9
Match the followings to their correct description. 

A. Intermediate Cross - Connect

B. Main Cross-Connect
C. Backbone Cabling
D. Horizontal Cabling
E. Horizontal Cross-Connect

Answer:
(a) Main Cross-Connect
(b) Backbone Cabling
(c) Intermediate Cross - Connect
(d) Horizontal Cross-Connect
(e) Horizontal Cabling

Question 10
The length of a MAC address is
a) 16 bits
b) 32 bits
c) 48 bits
d) 64 bits

Laboratory Quiz 2 

Question 1

Which of the following statement regarding network cabling of in a multi-story building is most likely to be TRUE?
a) There is an IDF in each floor.
b) There is an MDF in each floor
c) There is a POP in each floor
d) The IDF,MDF and POP is only located in the ground floor

Question 2

Which of the following could also serve as Intermediate Cross Connect?
a)  IDF
b) MDF
c) MCC
d) Telecommunication outlet

Question 3

Horizontal Cross Connect is placed inside __________.
a) IDF

b) POP

c) Work Area
d) Telecommunication outlet

Question 4

Which of the following location is ideal as wiring closet location?
(a)
(b)
(c)
(d)

Question 5

Backbone cabling is also known as________________ in multi-storey building.
a) horizontal cabling
b) vertical cabling
c) lateral cabling
d) parallel cabling

Question 6

Backbone cabling is also known as________________ in multi-storey building.
a) horizontal
b) backbone
c) lateral
d) special

Question 7

Which of the following is not suitable for horizontal cabling?
a) UTP

b) STP

c) Multimode fibre
d) Single mode fibre

Question 8

Ideally, the MDF should be close to the ________.
a) IDF
b) POP

c) work area
d) water closet

Question 9

In a multi-story building, where is the MDF usually located? Assumption: Distance to POP is not a factor
a) Ground floor
b) Middle floor
c) Top floor
d) Every floor

Question 10

Which of the following area is not covered by the ANS/TIA/EIA-569 Cabling standard?
a) Horizontal cabling

b) Backbone cabling

c) Telecommunication closet
d) Requirement analysis

Question 11
Which of the following is not considered as backbone cabling?
a) Networking between wiring closet and work areas.
b) Networking between wiring closets on different floors.
c) Networking between the MDF and POP.

d) Networking between building in a multi-building campus.

Question 12
Which of the following must be connected to the MCC directly?
a) IDF
b) HCC
c) Work area RJ45 socket
d) ICC

Question 13
A minimum of ____________ telecommunication outlets are required for each individual work area.
a) 2
b) 4
c) 5
d) 10

Question 14
Each __________ area should have a wiring closet.
a) 10 m2.
b) 100 m2.
c) 1,000 m2.
d) 10,000 m2.

Question 15
Wiring closet should avoid which of the following?
I. Water Pipes
II. Fluorescent Lighting
III. High Voltage Power Lines
IV. Air Conditioning and Heating Ducts

a) I and III only
b) II and III only

c) I, II and III only
d) I, II, III and IV

Question 16
B1. The diagram below is referred to in the 5 questions below. The diagram shows an office floor to be networked. What is the total number of work spaces in the floor? Assume workplace is 10 square meters.

a) 50

b) 250
c) 500
d) 1,000

Question 17
B2. Assuming that a single and a double RJ45 outlets are required per work space, what is the total number of RJ45 outlets required?

a) 500
b) 750
c) 1,000
d) 1,500

Question 18
B3. What is the average cable length in the floor?
a) 50
b) 75
c) 80
d) 125

Question 19
B4. Calculate the total cable length needed for the floor?
a) 75,000
b) 100,000
c) 112,500
d) 120,000

Question 20
B5. How many 1HU 24 ports patch panels are required?
a) 50
b) 63
c) 70
d) 82

Quiz 2
Question 1In the three-layer WAN model, which layer provides policy-based connectivity?
a) core
b) distribution
c) access
d) central

Question 2
A _______ is used to provide communications between hosts on different VLAN
a) switch
b) repeater
c) hub
d) router

Question 3
Which of the following design goals addresses the need to accommodate the ability to easily implement new technologies?
a) Functionality
b) Scalability
c) Adaptability
d) Manageability

Question 4
The traditional design rule states that ____ percent of a segment's traffic should be local to that segment, with only ______ percent addressed to other segments.
a) 20,80
b) 40,60
c) 80,20
d) 60,40


Question 5
Workgroup Servers needed by a unique set of users should be placed in the _____________, preferably in the same broadcast domain as the users.
a) core layer
b) distribution layer
c) access layer
d) central layer

Question 6
A _______ is used to connect users to the network and provide dedicated bandwidth per port.
a) switch
b) repeater
c) hub
d) router


Question 7
A _______ is used to connect users to the network and provide dedicated bandwidth per port.
a) core layer
b) distribution layer
c) access layer
d) central layer

Question 8
Which term describes the cabling that connects the customer site to the nearest exchange of the WAN service provider?
a) CPE
b) CO
c) local loop
d) DCE


Question 9
The figure below shows an example of a__________.

a) cut sheet
b) layer 1 logical diagram
c) addressing map
d) physical network map

Question 10
Which of the following design goals addresses the need to facilitate monitoring and ease of management?a) Functionality
b) Scalability
c) Adaptability
d) Manageability

Question 11

In the three-layer WAN model, which layer provides workgroup/user access to network?a) core
b) distribution
c) access
d) central

Question 12
The figure below shows an example of a__________. 

a) cut sheet
b) layer 1 logical diagram
c) addressing map
d) physical network map

Question 13
Which of the following design goals addresses the need to accommodate the ability to grow without major changes?a) Functionality
b) Scalability
c) Adaptability

d) Manageability

Question 14
The ability to connect securely to a private network over a public network is provided by which WAN technology?
a) DSL

b) PSTN
c) VPN

d) ATM

Question 15
Which type of WAN connection should be chosen when a dedicated point-to-point WAN communications path from the customer premises through the provider network to a remote destination is required?
a) analog dial-up
b) Asynchronous Transfer Mode
c) Frame Relay
d) Leased line

Question 16
Metro Ethernet network is a collection of __________.
a) Layer 2 switches connected through telephone cable.
b) Layer 2 or 3 switches or routers connected through optical fiber.
c) Layer 4 switches connected through high speed digital lines.
d) high speed routers connected through multimode optical fiber.

Question 17
Which of the following design goals addresses the need to accommodate the desired speed and reliability?
a) Functionality
b) Scalability
c) Adaptability

d) Manageability

Question 18
In the three-layer WAN model, which layer provides transport between remote sites?
a) core
b) distribution
c) access
d) central

Question 19
Which of the following WAN link option provides the maximum bandwidth?
a) T1
b) ISDN
c) Frame Relay
d) ATM

Question 20
With mainly Internet applications, ____ percent of traffic can go to the outside and _____ percent of traffic is local to that segment.
a) 80,20
b) 20,80
c) 40,60
d) 60,40