Need help on this 1. The protocol that asks for a MAC address for a known IP add

Question

Need help on this

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

. Answer

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"?

Answer

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"?

Answer

1. 192.168.1.1

2. 192.168.1.10

3. 192.168.1.11

4. 192.168.2.1

5. 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"?

The protocol that asks for a MAC address for a known IP address is Trace route relies on the field within the IP packet header. Which of the following is *not* a reason why a ping might timeout? 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.) 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 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 If "system 1" sent a packet to "system 3", what would be the destination MAC address when the packet left "system 1"? 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"? Describe the operation of RIP. Where can problems occur with RIP on large networks? What are the specific ICMP errors that are generated during a trace route? In the diagram below, which systems would generate which messages, if the trace route was being run from "System 1" to trace to "System 2"?

Explanation / Answer

1.

ARP (Address Resolution Protocol)

2.

Time to live

3.

The sending system will not respond to ICMP requests

4.

192.168.2.1

5.

255.255.240.0

6.

Router 3

7.

00:00:00:00:00:04

8.

192.168.2.10

9.

RIP stands for Routing Information Protocol.

It is a distance vector protocol that uses the hop count metric.

There are three version of RIP and these are; RIP vesrions 1 and 2 for IP version 4 and RIPng (next generation) for IP Version 6.

The general operation is that the router sends messages and takes other actions both in reaction to certain events and in response to certain triggers that has been set off by timers.

Timers are actually used to determine when the routing information should be discarded if it's not updated.

The main problems with RIP on large networks are:

Slow convergence - takes a long time for all routers to receive the same information and for topology changes to propogate
Routing loops - RIP does not include any mechanisms to detect or prevent routing loops. A routing loop can occur when Router A has an entry telling it to send to another network 1 to Router B and router B has an entry saying that data for network 1 should be sent to Router A.

10.

Time Exceed and Port Unreachable

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