1.Answer the following questions:

1.1 Which type of protocol is the best choice for a real-time system?

a. controlled access b. random access

1.2 Ethernet uses only one frame format, but WiFi uses both data and control frames.

a.True b. false

1.3 Full-duplex switched Ethernet does not have collisions

a. true b. false

1.4 Why cant CSMA/CD be used in wireless networks?

a. Wireless networks dont share the medium, so it is not required

b. The question is incorrect CSMA/CD is sometimes used in wireless networks

c. Electomagnetic interference

d. Collisions cannot always be detected in wireless networks, and CSMA/CD

depends on detecting collisions

1.5 What is the difference between a hub and a switch?

a.nothing - they are two names for the same device

b.a hub has many ports, but a switch can only have two ports

c.a hub sends all frames to all connected devices; a switch can filter frames and send them only to the destination device

d.a hub operates at layer 2 of the network model; a switch operates at layer 1

1.6 A junior IT employee links three switches together such that each switch connects to the two others. What will happen?

a. The switches will work as expected b. A broadcast storm

c. A VLAN is created d. The switches will act as routers

1.7 A 24 port Ethernet switch has been configured with three separate VLANs as

follows:

VLAN1: Server FS1, Workstations WS1, WS2 and WS3

VLAN2: Server FS2, Workstations WS4, WS5, and WS6

VLAN3: Server FS3, Workstations WS7, WS8, and WS9

If WS8 sends a network broadcast, which hosts will receive it?

a.All hosts

b.No hosts. VLANs do not support broadcasting

c.FS1, WS1, WS2, WS3

d.FS2, WS4, WS5, WS6

e.FS3, WS7, WS9

1.8 A 24 port Ethernet switch has been configured with three separate VLANs as

follows:

VLAN1: Server FS1, Workstations WS1, WS2 and WS3

VLAN2: Server FS2, Workstations WS4, WS5, and WS6

VLAN3: Server FS3, Workstations WS7, WS8, and WS9

WS4 wants to send a frame to server FS3. Which of these statements is true?

a.WS4 can communicate directly with FS3 since they are connected to the same physical switch

b.WS4 cannot communicate with FS3 under any circumstance

c.The only way they can communicate is to broadcast

d.The communication must pass through a router

2.For each protocol listed below, indicate whether it is a controlled access protocol, a random access protocol, or a channelization protocol.

a.Polling _____________________

b.Reservation _____________________

c.TDMA ______________________

d.CSMA/CD _____________________

e.FDMA _____________________

f.Token Passing ______________________

g.CDMA _____________________

h.CSMA/CA _____________________

Match the Cisco command line interface prompt with the mode.

_____ Switch>	A. Configuration mode
_____ Switch#	B. Interface level within configuration mode
_____ Switch(config)#	C. Privileged EXEC mode
_____ Switch(config-if)#	D. User EXEC mode

How can a receiver tell whether an Ethernet frame uses the original Ethernet standard or the IEEE 802.3 standard? [Hint: Just looking for the LLC/SNAP header is not sufficient, because the receiver has no way to know whether the data is a LLC/SNAP header or the beginning of the payload. ]

5.Why does a bridge or switch network run the Distributed Spanning Tree Algorithm? You do not need to explain the algorithm itself.

6.You type into a Cisco switch and the following (partial) table is displayed: (Fa0/x means FastEthernet port x on module 0)

Vlan Mac Address Type Ports ---- ----------- -------- -----

1 0018.b974.528f DYNAMIC Fa0/16 1 0019.0617.660f DYNAMIC Fa0/13 1 0019.0617.6610 DYNAMIC Fa0/14 1 0019.0617.6611 DYNAMIC Fa0/15 1 001b.d450.970f DYNAMIC Fa0/19 1 001b.d450.9710 DYNAMIC Fa0/20 1 001b.d450.9711 DYNAMIC Fa0/21

Assuming each MAC address belongs to a separate host, sketch the LAN, showing the switch, the switch port numbers, the hosts, and the MAC addresses of the hosts.

7.Answer the following questions concerning IP addressing:

7.1 Your computer has an IP address of 172.17.8.3 assigned to it with a subnet mask of 255.255.255.0. What is the IP address of your network?

a. 172.17.8.3 b. 172.17.0.0 c. 172.17.8.0 d. 172.0.0.0

7.2 Your computer has an IP address of 172.17.8.3 assigned to it with a subnet mask of 255.255.0.0. What is the broadcast address for your network?

a. 172.17.8.255 b. 172.255.255.255 c. 172.17.8.3 d. 172.17.255.255

7.3 Your network already uses IP addresses 192.168.1.1 through 192.168.1.254 and has a subnet mask of 255.255.255.0. What IP address to could you assign to a new workstation?

a. 192.168.1.0 b. 192.168.1.25 c. 192.168.2.1 d. No addresses are available

8.Consider the class-less IP network 130.45.130.0/21

a.How many bits are in the net id? _________________

b.How many bits are in the host id? __________________

c.How many possible hosts are there? __________________

d.What is the mask in binary and dotted decimal?

__________________________ and _______________________________

e. What is the broadcast IP address for this network? ____________________________

9.Is the host 128.235.201.16 on the network 128.235.204.0/22?

10.First, download and install Wireshark from https://www.wireshark.org/

Wireshark has versions for Windows, MAC OS, and Linux. I have found no problems with the Windows installation.

Use the Wireshark trace (nowep.cap) provided on Moodle to answer the questions below concerning 802.11 frames.

a.Examine packet 1, which is a beacon frame.

1)What is a beacon frame?

2)The beacon frame comes from the access point. What is the MAC of the access point? (Look at either the Transmitter address or the Source address)

3)What is the MAC of the destination? (Look at either the Receiver address or the Destination address)

4)The payload of the beacon frame is a wireless LAN Management frame, which has information about the access point. Use the LAN Management frame to find the beacon interval.

5)Use the LAN management frame to find the SSID.

6)Use the LAN management frame to find what channel the access point is using.

b.This wireless network is not encrypted. Therefore, we can see everything sent on the network. Select frame 422 which starts a FTP connection. Then choose Follow TCP Stream under the Analyze menu. What is the password?