Need a Real Computer Science expert 1. The protocol that asks for a MAC address

Question

Need a Real Computer Science expert

1. The protocol that asks for a MAC address for a known IP address is ..........................

Question 2

Traceroute relies on the .......................... field within the IP packet header.

Question 3

Which of the following is *not* a reason why a ping might timeout?

A. A router in between is filtering all ICMP traffic.

B. The destination has a firewall that will not accept ICMP traffic.

C. The sending system will not respond to ICMP requests

D. The destination system is powered off.

Question 4

Given a system that has an IP address of 192.168.2.25, and a subnet mask of 255.255.0.0, and the gateway address is 192.168.2.1 - what would be the first system to receive data sent (next hop/destination), if the final destination address is 192.168.23.193? (Assume all systems were up and working.)

A. 192.168.23.193

B. 192.168.2.1

C. 192.168.1.1

D. 127.0.0.1

Question 5

The subnet mask for a system with a natural class of the address of class "B", and the subnet id is 4 bits and the host id is 12 bits is ..........................

Question 6

If the "System 1" sends a packet with a destination address of "System 2", with a TTL=3, which system will respond with an ICMP error message? Assume all systems will send and respond to ICMP messages

A. System 1

B. Router 1

C. Router 2

D. Router 3

E. System 2

Question 7

If "system 1" sent a packet to "system 3", what would be the destination MAC address when the packet left "system 1"?

1. 00:00:00:00:00:01

2. 00:00:00:00:00:02

3. 00:00:00:00:00:03

4. 00:00:00:00:00:04

5. 00:00:00:00:00:05

Question 8

If "system 1" is sending a packet to "system 3", what would the destination IP address be in the packet sent when it leaves "system 1"?

A. 192.168.1.1

B. 192.168.1.10

C. 192.168.1.11

D. 192.168.2.1

E. 192.168.2.10

Question 9

1. Describe the operation of RIP. Where can problems occur with RIP on large networks?

Question 10

1. What are the specific ICMP errors that are generated during a traceroute? In the diagram below, which systems would generate which messages, if the traceroute was being run from "System 1" to trace to "System 2"?

Explanation / Answer

1.) ARP (Address Resolution Protocol)

2.) TTL (Time to Live) field

3.) Lets consider each option , option D is obvious, if the server is down it will not respond. Option B and C , ping uses ICMP protocol so if its blocked then there would be no response. But for Option A, since there is only one router which filters the ICMP packets, but if there's an alternate path where this router is not involved then ping might not get timed Out. So OPTION A is the ans.

4.) Option B

5.) 255.255.240.0 , because if host bits are 12 then network bits are 20 so subnet mask would be with 20 1's and 12 0's ie 11111111 11111111 11110000 0000000.

6.) Option D, Router 3. Since TTL is decreased by one at each router in the path, and error message is send when it reaches 0.

7.) 8.) insufficent data

9.) RIP prevents routing loops by implementing a limit on the number of hops allowed in a path from the source to a destination. The maximum number of hops allowed for RIP is 15. This hop limit, however, also limits the size of networks that RIP can support. A hop count of 16 is considered an infinite distance, in other words the route is considered unreachable.

RIP has the so called slow convergency or count-to-infinity problem, in which inconsistencies arise because routing update message propagate slowly across the network. P articularly, in large networks (or networks with slow links), some routers may still advertise a route that has vanished.

10.) ICMP Time exceeded http://en.wikipedia.org/wiki/ICMP_Time_Exceeded#Time_exceeded.

NO dig given

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