Q6: Intro to IP and Routing

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

Answer;
A)172.16.0.0/16
D)192.168.0.0/24
E)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.

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

Answer:

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

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

Answer:

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

Answer:
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 like 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 trucki, 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 recieved 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.