Bus 441 Exam 2

Front 1

The following address (2001:0002:0000:0000:0000:abcd:0bcd:0fea) can be simplified to __________

Back 1

2001:2::abcd:bcd:fea

Front 2

How will a stateful packet inspection (SPI) firewall handle an incoming packet containing a TCP SYN segment

Back 2

Process it through the Access Control List (ACL)

Front 3

The Frequency Spectrum is divided into _________ which are further divided into _________

Back 3

Service bands, channels

Front 4

Attackers only need to find a single weakness to break in. Consequently, companies must ________

Back 4

Have comprehensive security

Front 5

Which offers stronger security? WPA, 802.11i or both are equal

Back 5

802.11i

Front 6

Modern Ethernet networks use which kind of topology?

Back 6

Hierarchical Star

Front 7

What IEEE working group creates wireless LAN standards?

Back 7

IEEE 802.11

Front 8

You are setting up an Ethernet LAN in a small office space. The longest run of cabling you need is 70 meters. Your network needs a rated speed of 1 Gbps. You are considering using either 100Base-TX, 1000Base-T or 1000Base-SX. Which one(s) will work with your setup?

Back 8

1000Base-T and 1000Base-SX

Front 9

In digital signaling there is (are) ________ state(s)

Back 9

A finite number of

Front 10

If an 802.11n access point and an 802.11g client communicate, the communicate using _________

Back 10

802.11g

Front 11

A wireless host located at Company A sends a packet to a server on Company A's wired Ethernet LAN via an access point. How many frames will be involved in this one-way transmission?

Back 11

2

Front 12

Which of the following is usually optional in access point operation?

Back 12

RTS/CTS

Front 13

When a wireless computer wishes to communicate with a server, _________ can secure the communication against evil twin attacks

Back 13

VPN

Front 14

Name and describe two of the five wireless propagation problems we discussed

Back 14

Absorptive attenuation - the more moisture, the weaker the signal.
Shadow zones - signal cannot penetrate through obstacles and thus it is weakened.

Front 15

What happens if two nearby access points use the same channel?

Back 15

The will interfere with each other

Front 16

A binary signal is also a digital signal

Back 16

True

Front 17

The following network design is acceptable for a given 3-site company; however, it needs to be updated to ensure no network interruptions will occur if one of the 3 transmission lines goes down. Based on the textbook and class discussions, you need to figure out how to change the capacity on these transmission lines to support a possible failure on the 55Mbps transmission line (Jensen - Sallyn). Describe your modification by stating the new capacities for the three links.

Back 17

Smith - Jensen: 3.055Gbps
Jensen - Sallyn: 55Mbps
Smith - Sallyn: 455Mbps

Front 18

A channel extends from 55MHz to 60MHz. Its bandwidth is _________

Back 18

None are correct (55, 60, 65)

Front 19

An attacker must break through two firewalls to get to a host. This illustrates the principle called ___________

Back 19

Defense in depth

Front 20

When one pair in a UTP cord interferes with signals in other pairs, this is ___________

Back 20

Crosstalk interference

Front 21

As a signal propagates down a UTP cord, greater propagation distance will result in more noise errors, even if the average noise level is constant

Back 21

True

Front 22

Users of an access point share the transmission capacity of the access point. The throughput the share is called __________

Back 22

Aggregate throughput

Front 23

We discussed two advantages of using the 5GHz frequency over the 2.4GHz frequency. What is one of the advantages?

Back 23

Larger bandwidth

Front 24

What does the Wi-Fi Alliance call 802.11i?

Back 24

WPA2

Front 25

How will a stateful packet inspection (SPI) firewall handle an incoming packet containing a TCP segment which is an acknowledgement?

Back 25

Pass it if it is part of an approved connection

Front 26

When untwisting wire pairs in UTP, we do not untwist more than 1.25cm (a half inch) at their ends. This helps reduce a type of interference known as _____________

Back 26

Terminal crosstalk interference

Front 27

In the IPv4 address 1.2.3.4, what is the network part?

Back 27

We cannot say

Front 28

How many wires will you find in a Cat 5e UTP cord?

Back 28

8

Front 29

A packet with destination IP address 152.171.6.12 arrives at a router. Using the routing table below, which row will the router select to determine where to send the packet?

Back 29

1

Front 30

Name and describe the primary propagation problem with Multimode Fiver Optic transmission lines?

Back 30

Modal dispersion - light rays enter the cord at different angles (modes) and therefore, travel different distances as they bounce around. The signals may overlap and arrive out of order. This can cause them to be unreadable

Front 31

IEEE 802.11n uses what two unlicensed bands for data transmission?

Back 31

2.4GHz and 5GHz

Front 32

In what mode of 802.11i operation is a central authentication server used?

Back 32

802.1X mode

Front 33

An arriving packet has the destination IP address 152.143.180.14. What is the result if we mask it with 255.255.224.0?

Back 33

152.143.160.0

Front 34

The 20.4GHz band supports _________ nonoverlapping 20MHz channels.

Back 34

3

Front 35

What IEEE working group creates Ethernet LAN standards?

Back 35

IEEE 802.3