Intro to IP and Routing (Module 2)

Question 1

Which of the following networks are not part of the RFC 1918 private address specification?
(Choose three)

A. 172.16.0.0 /16

B. 192.168.0.0 /16

C. 10.0.0.0 /8

D. 192.168.0.0 /24

E. 10.0.0.0 /16

F. 172.16.0.0 /12

Answer 1

A, D, E (172.16.0.0/16, 192.168.0.0/24, 10.0.0.0 /16)

Explanation: The RFC 1918 specifies special networks in the Class A, B and C ranges that are
dedicated for private use and are not routable over the Internet. The trick to this question is that
although there are 3 classes of addresses involved, they do not all use classful masks.

RFC 1918 ranges:

10. 0.0.0 /8
11. 16.0.0 /12
12. 168.0.0 /16

Question 2

Which of the following is true regarding IP address assignments?

A. A host’s ip address can be statically or dynamically configured, while a router interface’s ip
address must be configured statically.

B. A host’s ip address must be dynamically configured, while a router interface’s ip can be
configured statically or dynamically

C. A host’s ip address can be statically or manually configured, while a router interface’s ip address
must be configured dynamically.

D. A host’s ip address can be statically or dynamically configured and a router interface’s ip address
can also be configured statically or dynamically.

Answer 2

D (A host’s ip address can be statically or dynamically configured and a router interface’s ip address
can also be configured statically or dynamically.)

Explanation: There area few different formats that you may see mac addresses written in, such as:

xxxx.xxxx.xxxx or xx:xx:xx:xx:xx:xx or xx-xx-xx-xx-xx-xx

But remember that mac addresses are made up of hexadecimal characters, so no letters above “F”

Question 3

How would you verify the ip address settings on a Linux Server?

A. ipconfig
B. ip config
C. ifconfig
D. show ipconfig

Answer 3

C (ifconfig)

Explanation: This command is very similar to the windows command “ipconfig”

Question 4

How would you verify the ip address settings on a Windows host?

A. ipconfig
B. ip config
C. ifconfig
D. show ipconfig

Answer 4

A (ipconfig)

Explanation: The ipconfig command can be used to verify basic ip address settings on a Windows
host. “ipconfig /all” gives more detailed ip addressing information for all NICs on a host. You can also
get rid of your currently leased DHCP address and request a new address using the commands:
“ipconfig /release” and then “ipconfig /renew”.

Question 5

Describe the function of a CRC in a layer 2 frame.

Answer 5

Explanation: If you were to use the analogy that a frame carrying user data is like a truck carrying a
user’s stuff. A CRC is ike the manifest for the delivery truck – it lists every item loaded on to the truck. If
you see an item on the list, but don’t find it in the truck, then the shipment has been corrupted in
transit. The CRC is a calculation based on the bits in the frame that takes place when the frame is
created on one side. When the frame is received by the far end, the CRC is recalculated to make sure
that nothing got corrupted in transit. If it did, then the frame is dropped.