Utilizing the millions of available wired and wireless connections already in place, progressive security installation companies are installing network cameras, intercom systems, video servers, access control systems and other electronic security components. Such installations not only leverage existing cabling and Internet connections, but also provide exciting new services and options that security dealers can provide for their clients.

For security installation companies to connect their devices onto these networks, they need to know the common concepts and terms used to network computers and other devices. To determine your level of knowledge of network technology, take SDM’s “20 Questions” quiz. Scroll down to score yourself.

1. Data communications

standards are produced by:

a. SIA

b. FCC


d. IBM

2. A computer network within

a building is called a:

a. WAN

b. MAN

c. LAN

d. PAN

3. Typical Ethernet networks

transmit data at:

a. 200 miles per hour.

b. the speed of sound.

c. 50-60 Mbps (Megabits

per second).

d. 100 Mbps.

4. Each Wi-Fi installation

requires a specific site license

from the Federal Communica-

tions Commission.

a. True

b. False

5. Computer protocols, such

as Ethernet and Wi-Fi,

transmit data in:

a. envelopes.

b. containers.

c. packets.

d. an uninterrupted stream.

6. To connect a node to an Ethernet

network, the device must have a:

a. telephone line.

b. DSL modem.

c. T1 line.

d. NIC .

7. A typical IP address for a LAN

device cannot be:





8. Networks use _____ to provide

temporary IP addresses to

connected nodes.



c. ARP

d. UDP

9. UTP Ethernet networks will

usually use the 568-B pinout

for jacks and plugs.

a. True

b. False

10. In addressing, what number

stays constant even when a

node’s IP address has been



b. Default router

c. MAC

d. Switch port setting

11. Why do routers have two

IP addresses?

a. One for the WAN,

one for the LAN

b. One for transmitting,

one for receiving

c. One for routing,

one for switching

d. One for data, one for

packet overhead

12. How can a Wi-Fi network

be made more secure?

a. Limit users by MAC address.

b. Disable broadcast

of SSID name.

c. Enable WEP encryption.

d. All of the above

13. Network cabling standards

for installations within a

building are included in:

a. FCC regulations

b. EIA/TIA 568

c. IEEE 802.11g

d. NSCA regulations

14. In a structured cabling

installation, cabling between

the main cross-connect and

an intermediate cross-

connect is called:

a. the pipeline.

b. 100 Megabit Ethernet.

c. data conduit.

d. the backbone.

15. 10/100 Ethernet transmissions

use how many pairs to

transmit and receive data?

a. One

b. Two

c. Three

d. Four

16. Which medium can carry

communications signals


a. Cat 3 UTP

b. Cat 6 UTP

c. Fiber optics

d. Coaxial cable

17. You are at the job site, and

you need to know the client’s

Internet IP address. You would:

a. call the ISP.

b. go on the Internet to


c. ask the customer for

their ISP contract.

d. get the IP from their

desktop computer.

18. To keep the IP address of a

cable modem or xDSL adapter

from changing, you can:

a. connect the power

transformer to a UPS.

b. place the device into a

secured cabinet.

c. order static IP addresses

from the ISP.

d. disable the adapter’s firewall.

19. UTP stands for:

a. unlimited transmission protocol.

b. unshielded twisted pair.

c. universal transmitter potential.

20. Firewall settings can block

the transmission of IP

network cameras.

a. True

b. False

Wally ‘Larman’s Pinging Problem

The security industry’s bungling installer, Wally ‘Larman, programmed and installed a network camera onto a client’s

network, as shown here. Wally can “ping” the camera and can view the camera’s images from the local computer, but cannot access the camera over the Internet. He’s confident, as always, that he has opened the router’s firewall for access to software port 80. Wally thinks the camera is defective. Can

you spot Wally’s problem and determine how to fix it?

Answer below

20 ANSWERS About Networking

Score yourself on your knowledge of networking technology.

1. c – The Institute of Electronic and Electrical Engineers (IEEE) is the standards-setting body for network communications.

2. c

3. d – While older Ethernet networks may operate at 10 Mbps (Megabits per second), most current network devices can communicate at either 10 or 100 Mbps. (Typical throughout, however, is actually 50 to 60 Mbps.)

4. False – 802.11b or .g Wi-Fi devices operate at 2.4 GHz, which is designated by the FCC as an open frequency range; any device can use it.

5. c

6. d – The Network Interface Card (NIC) provides Ethernet communications for a computer or other network device.

7. d – Internet and LAN IP addresses have four number groups, called octets, separated by periods. No individual number group can be of a higher value than 255.

8. b – Dynamic Host Control Protocol (DHCP) provides temporary and automatic IP addressing for network devices.

9. a – True

10. c – The MAC (Media Access Control) address is a unique number coded into Ethernet devices at the factory. The MAC is also called the physical or Ethernet address.

11. a

12. d – Most Wi-Fi access points and routers are factory defaulted to allow “open” access. All security measures should be programmed when installing Wi-Fi equipment.

13. b – The Electronic Industry Association and the Telecommunications Industry Association set the standards for network cabling in the United States.

14. d

15. b – While 10/100 uses two pairs, Gigabit Ethernet uses all four pairs of a typical UTP cable for communications.

16. c

17. b

18. c

19. b

a – True

Number of correct answers rating

20 Excellent

18-19 Very good

16-17 Good

14-15 Average

12-13 Below average

11 or fewer Poor

Answer to: Wally ‘Larman’s Pinging Problem:

If a camera or other network device connected to a gateway router is to be enabled for communications over the Internet, the correct LAN address of the gateway router must be programmed into the camera itself. Although the camera as programmed may provide a “ping” response from a local computer, Wally must reprogram the camera to Default Gateway to allow viewing and communication over the Internet.