CHAPTER 7 – PHYSICAL AND NETWORK TOPOLOGY SECURITY
TRUE/FALSE
1. In Red Hat Linux 9.x you configure screen effects, which are similar to a screen saver, and you can
associate a password with the screen effects.
2. In decentralized situations, servers are managed by server administrators from each department or
division, so that management of a server is customized to the specific needs of that department or
division.
3. NetWare 6.x enables you to configure a screen saver at the console by using the SSAVER command.
4. In Netware 6.x after you use the SECURE CONSOLE command, you cannot disable it without
rebooting the server.
5. The physical side of the network is how the signal is transferred from point to point along the cable.
6. A bus network segment must be within the IEEE length specifications to ensure that packets arrive in
the expected time.
7. The bus topology is easier to manage than the ring topology because the equipment used to build the
bus makes it easier to locate a defective node or cable problem.
8. The star topology is the oldest communications design, with roots in telephone switching systems.
9. A disadvantage of a bus network is that it requires more cable than does the traditional star.
10. Coaxial cable (typically called coax) comes in two varieties, thick and thin.
MODIFIED TRUE/FALSE
1. A(n) intermediate cross-connect is a wiring closet that houses the main-level cables and cables to main
networking and telecommunications devices. _________________________
2. In a bus topology, a terminator is connected to each end of the bus cable segment.
_________________________
3. Newer high-speed ring technologies employ three loops for redundant data transmission.
_________________________
4. It is more difficult with a(n) star topology than with the traditional bus topology for someone to create
an unauthorized tap into the network, because they need access to the central hub or switch.
_________________________
5. A(n) trunk is a high-capacity communications medium that joins networks and central network devices
on the same floor in a building, on different floors, and across long distances.
_________________________
6. Twisted-pair cable is used mainly in older LANs and in LANs that exist in areas with strong sources of
signal interference. _________________________
7. Twisted-pair cabling is more flexible than coax cable and therefore better for running through walls
and around corners. _________________________
8. When working with twisted-pair cabling, solid shielding is used for indoor wiring, and corrugated
shielding is used for outside or underground wiring. _________________________
9. UTP cable is the most frequently used network cable because it is relatively inexpensive and easy to
install. _________________________
10. An advantage of fiber-optic cable is that its high bandwidth and low attenuation (signal loss) enable it
to sustain transmissions over long distances. _________________________
MULTIPLE CHOICE
1. What kind of security is related to the purpose and location of a workstation?
a.
End User
c.
Workstation
b.
Desktop
d.
System
2. A _____ lock consists of a thick cable covered by vinyl, with one end permanently attached to a table
or an immobile object.
a.
hardware
d.
both a and b
b.
cable
e.
a, b, and c
c.
cipher
3. Which of the following operating systems can use screen savers to protect the desktop?
a.
Windows
c.
Mac OS X
b.
Linux
d.
All of the above
4. Which operating system uses XScreenSaver to lock the screen?
a.
Windows ME
c.
Mac OS X
b.
Red Hat Linux 9.x
d.
Netware 6.x
5. Which of the following fire suppression chemicals is considered to be an environmental concern?
a.
Soda acid
c.
Carbon dioxide
b.
Halon
d.
Baking soda
6. Which command in Netware 6.x allows you to configure a screen saver at the console?
a.
SCRSAVER
c.
SCRNSVR
b.
SSAVER
d.
SCREENSAVER
7. Which NetWare 6.x SCRSAVER command parameter starts the screen saver immediately and requires
a user account and password to go back into the console?
a.
Delay
c.
Activate
b.
Auto Clear Delay
d.
Enable
8. Which NetWare 6.x SCRSAVER command parameter enables the screen saver to work after it has
been disabled?
a.
Activate
c.
Re-enable
b.
Enable
d.
Start
9. Which NetWare 6.x SCRSAVER command parameter entered in seconds, determines the amount of
time that the keyboard is inactive before the screen saver starts?
a.
Auto Clear Delay
c.
Timer
b.
Wait
d.
Delay
10. Which NetWare 6.x SCRSAVER command parameter must be used at the time SCRSAVER is loaded
and prevents screen locking?
a.
Disable Lock
c.
No Password
b.
Enable Lock
d.
Disable
11. In Netware 6.x, how do you gain access back into the system after the screen saver starts and the
screen is locked?
a.
Console 1
b.
Server Console Authentication dialog box
c.
Command line authentication
d.
Ctrl+Alt+Del key sequence
12. What location can NLMs be loaded from when the SECURE CONSOLE command is run?
a.
sys:system
c.
Floppy disk
b.
DOS partition
d.
CD
13. Which type of network device provides remote communications, such as multiple modems and
connections to telecommunications lines?
a.
Routers
c.
Switches
b.
Firewalls
d.
Access servers
14. Which type of network device is used to link together network segments in a physical star fashion?
a.
Hub
c.
Router
b.
Switch
d.
Bridge
15. Which type of network device connects two or more cable segments and retransmits any incoming
signal to all other segments?
a.
Hub
c.
Repeater
b.
Bridge
d.
Switch
16. Which type of network device connects networks having the same or different access methods and
media, and forwards packets and frames to networks?
a.
Switch
c.
Bridge
b.
Router
d.
Firewall
17. Which type of network device links network segments and forwards and filters frames between
segments?
a.
Hub
c.
Bridge
b.
Router
d.
Switch
18. Which type of network device provides immediate battery power to equipment during a power failure
or brownout?
a.
Uninterruptible battery source
c.
Uninterruptible power supplies
b.
Redundant battery source
d.
Redundant power supplies
19. Which type of network device divides a communications medium into multiple channels so that
several nodes can communicate at the same time?
a.
Repeater
c.
Switch
b.
Multiplexer
d.
De-multiplexer
20. What type of interference is caused by magnetic force fields that are generated by electric devices such
as factory machinery, fans, elevator motors, and air-conditioning units?
a.
EMS
c.
RFI
b.
EMI
d.
EMF
21. Which EIA/TIA standard specifies various wiring closet configurations?
a.
232
c.
489
b.
442
d.
569
22. Which type of topology consists of cable running from one computer to the next?
a.
Star
c.
Ring
b.
Bus
d.
Hybrid
23. Which organization plays a leading role in developing standards for network cabling and data
transmissions?
a.
Comptia
c.
EIA/TIA
b.
ISO
d.
IEEE
24. What is one of the disadvantages of a ring network?
a.
It is more difficult to manage than a bus topology
b.
It is more expensive to implement than a bus topology
c.
It is not suited for transmitting signals over long distances on a LAN
d.
It does not handle high-volume network traffic as well as the traditional bus topology
25. What device does each computer connect to in a ring layout?
a.
Chassis switch
c.
Repeater
b.
Hub
d.
MAU
26. The _____ is the most popular topology.
a.
bus
c.
hybrid
b.
star
d.
ring
27. What is the biggest disadvantage of the star topology?
a.
It is more difficult to expand than a traditional bus network
b.
It is more difficult to manage than a traditional bus network
c.
It has a single point of failure
d.
It is easier to tap into than a traditional bus network
28. Which type of communication media is usually used to connect computers that demand high-speed
LAN and WAN access?
a.
Coax cable
c.
Fiber-optic cable
b.
UTP cable
d.
Wireless technologies
29. How are the optical light pulses generated in fiber-optic cabling?
a.
Laser
d.
Both a and b
b.
LED
e.
a, b, and c
c.
Photometer
30. Which type of cable is the most difficult to tap into?
a.
Twisted pair
c.
Fiber optic
b.
Thick coax
d.
Thin coax
31. What is the biggest disadvantage of shielded twisted-pair cabling?
a.
It is large in diameter and has limited bending capability
b.
It is relatively susceptible to EMI and RFI
c.
It is fragile and requires expertise to install
d.
It needs to have proper grounding
32. What type of fiber-optic cabling should be installed between floors in a proper cable plant?
a.
Single-mode
c.
Single-strand
b.
Multimode
d.
Multi-strand
33. What type of topology is displayed in the figure above?
a.
Star
c.
Ring
b.
Bus
d.
Bus-star
34. What type of topology is displayed in the figure above?
a.
Star
c.
Ring
b.
Bus
d.
Bus-star
35. What does “C” represent in the figure above?
a.
Aluminum sleeve
c.
Glass cladding
b.
Conductor insulation
d.
Optical fiber
YES/NO
1. Is twisted-pair cable more resistant to EMI and RFI than thin coax cable?
2. Is UTP cable the most frequently used network cable because it is relatively inexpensive and easy to
install?
3. Is it easy for someone to place unauthorized taps into fiber-optic cable?
4. When installing a cable plant, should you use single-mode fiber-optic cable for long runs, such as long
distances between buildings?
5. Does horizontal wiring typically encompass multiple floors in a building, fanning out to various rooms
and office areas?
6. In Red Hat Linux 9.x, is SNMP typically installed during the initial installation of the operating system
on TCP/IP servers?
7. Is a VLAN a physical network that consists of subnetworks of workgroups established through
intelligent software on switches and routers, and is it independent of the logical network topology?
8. Does physical security further involve the location of computers and network devices in a building,
along with the construction quality of that building?
9. When you run SECURE CONSOLE in NetWare, can NLMs be loaded if they are not already in a
protected system directory sys:system or C:\nwserver?
10. Is a centralized layout like a star with workstations as its points?
COMPLETION
1. ____________________ is the transmission capacity of a communications medium, which is typically
measured in bits per second (for data communications) or in hertz (for data voice and video
communications), and is determined by the maximum minus the minimum transmission capacity.
2. _________________________ refers to installing cable that fans out in a horizontal star fashion from
one or more centralized hubs or switches, which are located in telecommunications rooms or wiring
closets.
3. Using ____________________ cable for vertical wiring not only enables you to scale the speed of
your backbone for high-speed communications, it also has the advantage that it is not affected by EMI
or RFI.
4. ____________________ is a protocol in the TCP/IP suite that enables computers and network
equipment to gather standardized data about network activity.
5. In a(n) ____________________ server farm configuration, the servers are in one area in which they
are easy to maintain, such as at central chassis switch locations.
6. In a(n) ____________________ server security model, the physical security used for servers may vary
widely from server to server and department to department.
7. A(n) ____________________ is a device that secures data from being accessed outside a network and
prevents data from leaving the network through an inside source.
8. ____________________ should be secured with locks, supplied with conditioned and properly
grounded power, and be environmentally controlled to offer a constant temperature range and
protection from excessive moisture.
9. ______________________________ is caused by electrical devices that emit radio waves at the same
frequency used by network signal transmissions.
10. A(n) ____________________ is the physical layout of cable and the logical path followed by network
packets sent on the cable.
MATCHING
Match the following terms to the appropriate definition.
a.
Access servers
f.
Multiplexer
b.
Bandwidth
g.
Plenum
c.
Cable plant
h.
Server farm
d.
Cipher lock
i.
Topology
e.
Device lock
j.
Wiring closet
1. A keyless lock that is often programmable
2. A grouping of servers placed in the same location
3. The transmission capacity of a communications medium
4. A room used to store telecommunications and networking equipment
5. An enclosed area, such as a false floor or ceiling
6. A locking device that attaches a network device to a stationary object
7. The physical layout of cable and the logical path followed by network packets
8. The total amount of communications cable that makes up a network
9. A switch that divides a communications medium into multiple channels
10. Devices that provide remote communications
SHORT ANSWER
1. What are the three elements to following a structured design when designing a network?
2. Structured networks enable the network administrator to do what seven tasks?
3. What are two potential problems that can exist with VLANs?
4. What are the three general categories of physical security?
5. What security concepts should be taught to workstation users when training them about physical
security?
6. When planning where to locate servers in your organization, what security measures should you
consider implementing?
7. List eight different network devices.
8. Properly designed wiring closets follow the EIA/TIA-569 standard, which specifies
what three wiring closet configurations?
9. What four different network topologies are in use in networks today?
10. What four basic communications media are used in networks?