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Cisco CCNP ENCOR > Network Assurance > Flashcards

Network Assurance Flashcards

Netflow, SPAN, SNMP, IP SLA, DNA Center, etc.

1
Q

What is SNMP?

A

Simple Network Management Protocol

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2
Q

What are the key differences of SNMPv3 over v1 and v2?

A
  • User authentication
  • Username hashing (MD5 and SHA)
  • Encryption
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3
Q

What are the key elements that need to be configured on a Cisco device to send SNMP data to a client?

A
  • SNMP host/client
  • Access Lists to restrict SNMP
  • Read Only Community String
  • Read Write Community String
  • SNMP location
  • SNMP contact
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4
Q

What is the command to send SNMP to a client or host?

A

R1(config)# snmp-server community {string} {ro | rw} {access-list-id}

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5
Q

What is an SNMP trap?

A

An alert that can be sent via SNMP in response to a network event

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6
Q

What is the command to enable SNMP traps on a Cisco device?

A

R1(config)# snmp-server enable traps [type]

There are a lot of SNMP trap types that can be enables. Not specifying a trap type will enable all SNMP traps which may not be desirable.

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7
Q

What are the 8 levels of Syslog Severity Messages?

A

7 - Debug
6 - Informational
5 -Notifications
4 - Warning
3 - Errors
2 - Critical
1 - Alerts
0 -Emergency

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8
Q

What command is used to send log messages to the local device’s buffer?

A

R1(config)# logging buffer {buffer-size-in-bytes} {severity-level}

NOTE: The severity level can be numbered or the word. Log events up to the configured level will be logged.

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9
Q

What command is used to verify logging on a Cisco device?

A

R1# show logging

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10
Q

What port is used by Syslog to send logging information to a remote Syslog collector?

A

UDP 514

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11
Q

What command is used on a Cisco device to send Syslog to a remote host?

A

R1(config)# logging host {ip-address}

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12
Q

What is the port used by the Netflow protocol?

A

Netflow is UDP but it does NOT have an assigned port number. Each flow sensor will use a unique port number as designated by an admin.

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13
Q

What are the three pieces you need to configure to create flexible netflow on a router?

A

Flow Record
Flow Export
Flow Monitor

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14
Q

What two things do you need to do to configure a flow record?

A

1.) Use the “match” command to define the flow criteria

2.) Use the “collect” command to define what data you want to gather from the flow

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15
Q

What two things do you need to do to configure a flow exporter?

A

1.) The destination collector server, using the destination command

2.) The port number for the flow sensor using the transport udp {port} command

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16
Q

What two things do you need to configure a flow monitor?

A

1.) the flow record to be used with the record NAME command

2.) the flow exporter to be used with the exporter NAME command

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17
Q

What are the commands to enable basic netflow for interface Gi0/0 on a router for the destination of 10.1.0.111 using the port 9998?

A

R1(config)# int gi0/0
R1(config-if)# ip flow ingress
R1(config-if)# ip flow egress
R1(config)# ip flow-top-talkers
R1(config-flow-top-talkers)# top 5
R1(config-flow-top-talkers)# sort-by bytes
R1(config)# ip flow-export version 9
R1(config)# ip flow-export destination 10.1.0.111 9998

18
Q

Using IOS commands, configure a flexible netflow that uses source ipv4 address to collect ipv4 source, destination, and protocol information and apply it to interface gi0/0

A

R1(config)# flow record FLOW_REC_1
R1(config-flow-record)# description basic netflow information
R1(config-flow-record)# match ipv4 source address
R1(config-flow-record)# collect ipv4 source address
R1(config-flow-record)# collect ipv4 protocol
R1(config-flow-record)# collect ipv4 destination address
R1(config)# flow exporter FLOW_EXP_1
R1(config-flow-exporter)# description flows exported to my PRTG server A
R1(config-flow-exporter)# destination <flow>
R1(config-flow-exporter)# transport udp <flow>
R1(config)# flow monitor FLOW_MON_1
R1(config-flow-monitor)# exporter FLOW_EXP_1
R1(config-flow-monitor)# record FLOW_REC_1
R1(config)# int gi0/0
R1(config-if) ip flow monitor FLOW_MON_1 input</flow></flow>

19
Q

What show commands would you use to verify flexible netflow on a Cisco device?

A

show flow recorder

show flow exporter

show flow monitor

20
Q

When using the show commands to verify netflow, how are the source and destination port numbers displayed?

A

In hexadecimal format (instead of decimal)

21
Q

What command(s) could you use to verify the netflow is working?

A

show ip cache flow

show ip flow top-talkers

NOTE: Netflow data on a router expires quickly so these commands are really only good to troubleshoot if netflow is working.

22
Q

What are the basic commands to configure IP SLA with an icmp probe that runs every 10 seconds (4 commands)?

A

Router(config)# ip sla {probe-id}
Router(config-ip-sla)# icmp-echo {dest-ip-address} source-interface {interface-id}
Router(config-ip-sla-echo)# frequency 10
Router(config)# ip sla {probe-id} life forever start-time now

23
Q

What are the basic commands to configure IP SLA with an http probe that runs every 1 minute (4 commands)?

A

Router(config)# ip sla {probe-id}
Router(config-ip-sla)# http get {URL}
Router(config-ip-sla-echo)# frequency 60
Router(config)# ip sla {probe-id} life forever start-time now

24
Q

What commands would you use to create an IP SLA track object and use it to influence a static route?

A

Router(config)# track {id} ip sla {probe-id}
Router(config)# ip route {ip-address} {subnet-mask} {next-hop} track {track-id}

25
Q

What does SPAN mean?

A

Switchport Analyzer - this is basically just mirroring a switchport

26
Q

What are the three types of SPANs and what is the difference between each one?

A

SPAN - capture on a local switch

RSPAN - capture on a remote switch

ERSPAN - capture on a remote network

27
Q

What commands would you use to configure a Cisco switch to mirror port fa0/1 and send the traffic to fa0/24?

A

SW1(config)# monitor session {session-id} source interface fa0/1
SW1(config)# monitor session 1 destination interface fastEthernet 0/24

28
Q

What is the key configuration element you need to configure to perform RSPAN?

A

A dedicated VLAN must be established on the source and destination switches and permitted across the trunk.

29
Q

What commands would you need to configure RSPAN from the source ports of Switch2 on fa0/1 to the destination port of fa0/24 on Switch1?

A

SW2(config)# vlan 99
SW2(config-vlan)# remote-span
SW2(config)# monitor session 1 source interface fa0/1
SW2(config)# monitor session 1 destination remote vlan 99
SW1(config)# vlan 99
SW1(config-vlan)# remote-span
SW1(config)# monitor session 1 source remote vlan 99
SW1(config)# monitor session 1 destination fa 0/24

30
Q

What commands are needed to configure ERSPAN on a remote switch?

A

RemoteSW1(config)# monitor session 1 type erspan-source
RemoteSW1(config-mon-erspan-src)# source interface gi0/10 both
RemoteSW1(config-mon-erspan-src)# no shut
RemoteSW1(config-mon-erspan-src)# destination
RemoteSW1(config-mon-erspan-src-dst)# ip address <ip>
RemoteSW1(config-mon-erspan-src-dst)# erspan-id 2
RemoteSW1(config-mon-erspan-src-dst)# origin ip <ip></ip></ip>

31
Q

What commands are needed to configure ERSPAN on the local switch?

A

LocalSW1(config)# monitor session 1 type erspan-destination
LocalSW1(config-mon-erspan-dst)# no shut
LocalSW1(config-mon-erspan-dst)# destination interface gigabitEthernet 0/2
LocalSW1(config-mon-erspan-dst)# source
LocalSW1(config-mon-erspan-dst-src)# erspan-id 2
LocalSW1(config-mon-erspan-dst-src)# ip address <ip>
LocalSW1(config-mon-erspan-dst-src)# origin ip address <ip></ip></ip>

32
Q

What show command(s) can you use to verify a SPAN session is running?

A

show monitor session all

show monitor session <session></session>

33
Q

What is IP SLA?

A

A Cisco IOS tool that can perform continuous monitoring about certain aspects of network performance.

34
Q

What are some of the most common types of IP SLA probes that can be configured on a Cisco device?

A
  • icmp
  • http
  • dhcp
  • dns
  • voip
  • icmp or udp jitter
35
Q

What network quality metrics does IP SLA set out to measure?

A
  • Delay
  • Jitter
  • Packet Loss
  • Connectivity
  • VoIP quality
  • Server Download time
  • Network Path
36
Q

When configuring IP SLA on a Cisco device, what are the two essential elements that must be configured?

A

1.) Probe
2.) Schedule

37
Q

What is the command to create an IP SLA probe?

A

R1(config)# ip sla {id-number}

38
Q

What are the commands to set up an IP SLA ICMP probe that repeats every 60 seconds? (3 commands)

A

R1(config)# ip sla {id-number}
R1(config-ip-sla)# icmp-echo {target-address} source-interface {int-id}
R1(config-ip-sla-echo)# frequency 60

39
Q

What are the commands to set up an HTTP GET probe that repeats every 5 minutes? (3 commands)

A

R1(config)# ip sla {id-number}
R1(config-ip-sla)# http get {url}
R1(config-ip-sla-echo)# frequency 300

40
Q

What is the command to create a schedule to start an IP SLA probe(s)?

A

R1(config)# ip sla schedule {id-number} life {forever | value-in-secs} start-time {now | hh:mm:ss}

41
Q

If you wanted to use an IP SLA as a routing metric, what command would you use?

A

R1(config)# track {id-number} ip sla {sla-id}

Cisco CCNP ENCOR (22 decks)

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