Chapter 19 - Managing Network Devices

Question 1

What is Simple Network Management Protocol?

Answer 1

SNMP - An application layer protocol that provides a message format for communication between what are termed managers and agents.

Question 2

What is an example of an SNMP manager or Network Management Software (NMS)?

Answer 2

Cisco Prime

Question 3

What are the messages that poll information from the SNMP agent referred to?

Answer 3

GET messages

Question 4

What are the messages that write variables referred to?

Answer 4

SET messages

Question 5

What are SNMP traps?

Answer 5

When the device itself independently notifies the NMS when a problem occurs.

Question 6

What are the 3 main versions of SNMP?

Answer 6

1, 2c, and 3

Question 7

What versions of SNMP only support community strings to authenticate access to MIB objects?

Answer 7

Version 1 and Version 2c

Question 8

What 3 security protocol features are offered with SNMPv3?

Answer 8

1. Message integrity - Helps ensure that a packet has not been tampered with in transit.
2. Authentication - Helps ensure that the packet came from a known and trusted source.
3. Encryption - Helps ensure that information cannot be read if the data is captured in transit.

Question 9

What are the 3 possible security modes of SNMP version 3?

Answer 9

1. noAuthNoPriv - authentication method is username
2. authNoPriv - authentication method is Message Digest 5 or Secure Hash Algorithm (SHA)
3. authPriv - Message Digest 5 (MD5) or Secure Hash Algorithm (SHA)

Question 10

What are the 8 system message severity levels?

Answer 10

0 - Emergency - The system my be unusable.
1 - Alert - Immediate action may be required.
2 - Critical - A critical event took place.
3 - Error - The router experienced an error.
4 - Warning - A condition might warrant attention.
5 - Notification - A normal but significant condition occurred.
6 - Informational - A normal event occurred.
7 - Debugging - The output is a result of a debug command.

Question 11

What is the purpose of NetFlow?

Answer 11

To as efficiently as possible provide statistics on IP packets flowing through network devices.

Question 12

To capture the flow data, what commands does the engineer need to add to the interfaces?

Answer 12

ip flow ingress (monitors incoming packets)

ip flow egress (monitors outgoing packets)