24. Network Assurance

Question 1

What is the command to repeat PING?

Answer 1

ping ip repeat number

Question 2

What is traceroute?

Answer 2

Troubleshoot command to determine where traffic is failing as well as what path it takes througout the network.

Question 3

What is displayed when a traceroute times out?

Answer 3

An Asterisk

Question 4

What is the default hops/times for traceroute?

Answer 4

30

Question 5

What does !H mean in the traceroute result?

Answer 5

Host unreachable

Question 6

When do u use the most common use for debugging?

Answer 6

When there is a need to view things at a deeper level

Question 7

How can you prevent a stream of debug messages?

Answer 7

With conditional debugging

Question 8

What are the 2 options for conditional debugging?

Answer 8

• Based on access-list (debug ip packet)

- Based on interface (debug interface)

Question 9

What is the command to turn off debugging?

Answer 9

undebug all

undebug interface ….

Question 10

What is the SNMP?

Answer 10

Simple Network Management Protocol. It sends unsolicited TRAP messages to a SNMP collector or Network Management System

Question 11

What are the 3 versions of SNMP?

Answer 11

SNMPv1
SNMPv2c
SNMPv3

Question 12

Which version of SNMP uses encryption?

Answer 12

SNMPv3 authPriv

Question 13

What type of authentication do does SNMPv1 & SNMPv2c use?

Answer 13

Community string

Question 14

What is the defaul SNMP version when none is selected?

Answer 14

SNMPv1

Question 15

What is the command to enable TRAPS?

Answer 15

snmp-server enable traps

Question 16

What are the 3 types of syslog options?

Answer 16

• Console
• Logging buffer
• Off-box collector

Question 17

What does the logging buffer do?

Answer 17

It stores all of the syslog messages

Question 18

What is the default type for syslog messages to be sent to?

Answer 18

• Console

Question 19

What is the default size of the logging buffer?

Answer 19

4096

Question 20

What must be done before sending syslog messages?

Answer 20

Set the date/time on the device

Question 21

What is Netflow?

Answer 21

Provides data information

Question 22

What are the 2 components of Netflow?

Answer 22

• NetFlow Data Capture

- NetFlow Data Export

Question 23

What is important to remember about NetFlow?

Answer 23

Statistics are stored in the memory cache. It can consume a lot of resoureces for this reason.

Question 24

Where does NetFlow capture it’s data?

Answer 24

Ingress and egress

Question 25

What NetFlow traffic type is collected ingress?

Answer 25

• IP to IP
• IP to MPLS
• Frame Relay terminated
• ATM terminated

Question 26

What NetFlow traffic type is collected egress?

Answer 26

• All IP packets

- MPLS to IP

Question 27

What is a flow in NetFlow?

Answer 27

A unidirectional traffic strams that contains a combination of:

• Source IP
• Destination IP
• Source port number
• Destination port number
• L3 protocol type
• Type of Service
• Input logical interface

Question 28

What is the difference between NetFlow and NetFlow Flexible?

Answer 28

More flexible

Question 29

What are the 3 types of SPAN?

Answer 29

• Local Switch Port Analyzer
• RSPAN
• ERSPAN

Question 30

What is LSPA?

Answer 30

Local Switch Port Analyzer, captures local traffic on a switch and sends a copy of the network traffic to a local port attached

Question 31

What is RSPAN?

Answer 31

Captures local traffic on a remote switch and sends a copy of the network traffic to the local switch through L2

Question 32

What is ERSPAN?

Answer 32

Captures local traffic on a remote switch and sends a copy of the network traffic to the local switch through L3. Uses encapsulation

Question 33

What is IP SLA?

Answer 33

A tool built in Cisco software that allows for continious monitoring of various aspects of the network.

Question 34

What are the 8 types of probes that IP SLA can monitor?

Answer 34

• Delay
• Jitter
• Packet loss
• Packet sequencing
• Path
• Connectivity
• Server of website download time
• Voice quality scores