SI110 Homework Alpha: ________ Name: __________________
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Collaboration Policy: Default
MIDN Last, F.
choose one: □ None □ XS110 □ EI with:
(or more)
□ MGSP
□ Discussed with: ______________________
Homework: /SI110/Cyber Battlefield/Networking - Wireless
1. [ 15 / 10 / 5 / 0 ] State which of the five TCP/IP stack layer(s) change(s) when moving from a
wired network to a wireless network and what the change is for that layer.
2. [ 15 / 10 / 5 / 0 ] WEP, WPA, and WPA2 are used to solve what two problems we don’t have
when we have strictly wired networks:
3. [ 15 / 10 / 5 / 0 ] Suppose you are sitting in a large international airport and want to connect to
the free wi-fi. You check for wireless networks within range and see the SSID free-airport. You
open up Xirrus and can see the MAC address for the connection. Explain why this does not
necessarily mean that there is only one base station in the entire airport; use complete sentences.
4. [ 15 / 10 / 5 / 0 ] If you perform a tracert from your host to rona.academy.usna.edu,
and then ssh to rona and perform a tracert (traceroute in UNIX) to your host’s IP
address, will the two outputs be the same, reversed, or completely different? Explain why; use
complete sentences, spelling and grammar count.
SI110 Homework
Alpha: ________
Name: __________________
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5. Consider the shell session below, which shows output from: arp -a, two tracert’s and
ipconfig. Answer the following:
a. [ 10 / 8 / 5 / 0 ]
What is the destination MAC
address on the packet as it
travels to hop 1 of the first
tracert?
b. [ 10 / 8 / 5 / 0 ]
Below is a diagram in which
dots represent hosts, each
labeled by an IP address.
Given the shell session, circle
the host executing the
commands in the diagram
below.
c. [ 20 / 15 / 10 / 0 ]
Use the output from arp
AND the tracert commands
to decide which hosts can
communicate directly with
each other. In the diagram
below, draw lines between the
dots (hosts) that have a direct
connection from the Network
Layer’s perspective. In other
words, there may be switches
or base stations or other Link
Layer devices in between, but
because Link Layer devices have no IP addresses, from the Network Layer’s perspective the
hosts on the same local network are directly connected and can communicate directly with the
other hosts on the network. (example line below)