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CCNP Troubleshooting > CCNP Troubleshooting > Flashcards

CCNP Troubleshooting Flashcards

1
Q

Command: Display routing protocols status.

A

show ip protocols

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2
Q

Command debug | EIGRP: displays all EIGRP messages that are sent and received on a router

A

debug eigrp packets

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3
Q

Common reasons that the EIGRP adjacency fails follow:

A
  • AS mismatch
  • K value mismatch
  • Misconfigured network command
  • Passive interface
  • Authentication misconfiguration
  • Security filtering
  • Unidirectional link
  • Misconfigured subnet mask
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4
Q

Command | EIGRP: Display interfaces that are running EIGRP

A

show ip eigrp interfaces

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5
Q

Which command is used to verify the TCP connection for a BGP session?

A

show tcp brief | include 179

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6
Q

You can use several methods at the same time. For the inbound updates, the order in which the methods are applied follows:

A
  • Route-map
  • Filter-list
  • Prefix-list/distribute-list
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7
Q

For the outbound updates the order follows:

A
  • Prefix-list/distribute-list
  • Filter-list
  • Route-map
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8
Q

Command: Display the BGP table. Add the summary keyword to display the status.

A

show ip bgp [summary]

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9
Q

Command: Display the received routes by the BGP peer.

A

show ip bgp neighbors ip-address routes

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10
Q

Command: Display the advertised routes by the BGP peer.

A

show ip bgp neighbors ip-address advertised-routes

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11
Q

Command: Display information about the processing of BGP updates or display BGP events.

A

debug ip bgp {updates | events}

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12
Q

There are several possible reasons for an erroneous clock on network devices:

A
  • Access control lists do not permit UDP port 123 packets.
  • An NTP authentication mismatch exists.
  • Time zone and summer time misconfigurations are on the router.
  • The time server is not accessible.
  • The NTP server is misconfigured.
  • The NTP server lost sync.
  • High CPU utilization is present.
  • A high offset is between the server and the client.
  • The stratum is too high.
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13
Q

NTP protocol and port number

A

NTP uses UDP port 123.

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14
Q

NTP authentication method

A

MD5

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15
Q

Command: Display the NTP status.

A

show ntp status

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16
Q

Display the NTP associations

A

show ntp associations

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17
Q

Display the NTP events that occur.

A

debug ntp events

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18
Q

The server that is used to synchronize the clock is indicated with the ______ at the beginning of the line

A

asterisk (in the “show ntp association” output)

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19
Q

For the inbound updates the order follows:

A
  • Route-map
  • Filter-list
  • Prefix-list/distribute-list
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20
Q

Command: Check if routing is enabled on the multilayer switch

A

show running-config | include ip routing

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21
Q

Command: To add the DNS server IP address to the DHCP configuration

A

dns-server 209.165.201.209

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22
Q

Command: DNS manual configuration in DNS client

A

ip name-server 209.165.201.209

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23
Q

Command: renovar dhcp

A

renew dhcp ethernet 0/0

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24
Q

Command: reload in certain time

A

reload in 15

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25
Q

Command: calcel programed device reload

A

reload cancel

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26
Q

DNS port

A

53 udp/tcp

27
Q

FTP ports

A

20-21 tcp

28
Q

Telnet port

A

23 tcp

29
Q

SMTP port

A

25 tcp/udp

30
Q

DHCP port

A

67-68 udp

31
Q

TFTP port

A

69 udp

32
Q

SNMP port

A

161-162 udp

33
Q

Microsoft SQL ports

A

1433-1434

34
Q

Command: replace the running configuration with the startup configuration, which will override, append, or delete configuration elements that are different.

A

configure replace startup-config

35
Q

Command: The startup-configuration commands are added to the running configuration. However, commands that already exist in the running configuration but that are not in the startup configuration are not removed.

A

copy startup-config running-config

36
Q

displays a summary of information about EIGRP address families

A

show eigrp plugins

37
Q

EIGRP | reveals information for all address families that are configured.

A

show ip eigrp protocols

38
Q

EIGRP | displays a list of network prefixes and the related information.

A

show eigrp address-family {ipv4 | ipv6} [autonomous-system-number] [multicast] accounting

39
Q

EIGRP | displays an interface-specific configuration.

A

show eigrp address-family {ipv4 | ipv6} interfaces detail [interface-type interface-number]

40
Q

EIGRP | displays information about all summary routes.

A

show eigrp address-family {ipv4 | ipv6} topology route-type summary

41
Q

EIGRP | displays information on passive interfaces and a list of network prefixes.

A

show ip protocols and show running-config | section router eigrp

42
Q

EIGRP | displays all packets except hellos.

A

debug eigrp packet terse

43
Q

EIGRP | displays information about the stub status of the peer routers.

A

debug eigrp packet stub

44
Q

EIGRP | The remote router advertises only its connected routes.

A

eigrp stub connected

45
Q

EIGRP | The remote router advertises only its static routes.

A

eigrp stub static

46
Q

EIGRP | The remote router advertises only other protocols and AS routes.

A

eigrp stub redistribute

47
Q

EIGRP | The remote router advertises only summary routes.

A

eigrp stub summary

48
Q

EIGRP | The remote router does not advertise routes.

A

eigrp stub receive-only

49
Q

EIGRP | display the stub status of neighbors and which routes are advertised.

A

show ip eigrp neighbors detail

50
Q

debug | to display all EIGRP packets except hellos.

A

debug eigrp packet terse

51
Q

debug eigrp | display information about the stub status of the peer routers.

A

debug eigrp packet stub

52
Q

check whether routing is enabled on the device using:

A

show ip route—no output means routing is not enabled.

show running-config—the lack of the “no ip routing” statement; cef statements: “ip cef” or “ipv6 cef” mean IP routing is enabled.

53
Q

There are three ways to configure default route information on Layer 2 and multilayer devices:

A
  • Switch# ip route 0.0.0.0 0.0.0.0 {ip-address | interface-type interface-number [ip-address]}

Use this command when routing is enabled on the device.

  • Switch# ip default-network network-number

Use this legacy command when routing is enabled on the device.

  • Switch# ip default-gateway network-number

Use this command on pure Layer 2 devices.

54
Q

The recipe to application optimization is a four-step cycle

A

Step 1. Baseline application traffic.
Step 2. Optimize the network.
Step 3. Measure, adjust, and verify.
Step 4. Deploy new applications.

55
Q

Netflow | The seven fields that need to match for packets to be considered part of the same flow are as follows:

A
  • Source IP Address
  • Destination IP Address
  • Source Port (protocol dependent)
  • Destination Port (protocol dependent)
  • Protocol (Layer 3 or 4)
  • Type of Service (ToS) Value (differentiated services code point [DSCP])
  • Input Interface
56
Q

To implement IP SLA network performance measurement, you need to perform the following tasks:

A
  • Enable the IP SLA responder, if required.
  • Configure the required IP SLA operation type.
  • Configure any options available for the specified operation type.
  • Configure threshold conditions, if required.
  • Schedule the operation to run, and then let the operation run for a period of time to gather statistics.
  • Display and interpret the results of the operation using the Cisco IOS CLI or an NMS, with SNMP.
57
Q

For Cisco AutoQoS to work certain requirements must be met, as follows:

A
  • CEF must be enable on the interface.
  • The interface (or subinterface) must have an IP address configured.
  • For serial interfaces (or subinterfaces) configure the appropriate bandwidth.
  • On point-to-point serial interfaces, both sides must be configured AutoQoS.
58
Q

Troubleshooting performance problems is a three-step process:

A

Step 1. Assessing whether the problem is technical in nature
Step 2. Isolating the performance problem to a device, link, or component
Step 3. Diagnosing and resolving the performance degradation at the component level

59
Q

The following events cause spikes in the CPU utilization:

A
  • Processor-intensive Cisco IOS commands
  • Routing protocol update processing
  • SNMP polling
60
Q

Some common interface and wiring problems are as follows:

A
  • No cable connected
  • Wrong port
  • Device has no power
  • Wrong cable type
  • Bad cable
  • Loose connections
  • Patch panels
  • Faulty media converters
  • Bad or wrong GBIC
61
Q

Common symptoms of a router CPU that is too busy is that the router fails to respond to certain service requests. In those situations, the router might exhibit the following behaviors:

A
  • Slow response to Telnet requests or to the commands issued in active Telnet sessions
  • Slow response to commands issued on the console
  • High latency on ping responses or too many ping timeouts
  • Failure to send routing protocol packets to other routers
62
Q

When troubleshooting CEF, you always want to check and verify the following:

A
  • Is CEF enabled globally and per interface?
  • Is there a FIB entry for a given network destination?
  • Is there a next hop associated with this entry?
  • Is there an adjacency entry for this next hop?
63
Q

Symptoms of memory-allocation failures include the following:

A
  • Messages such as %SYS–2–MALLOCFAIL: Memory allocation of 1028 bytes failed from 0x6015EC84, Pool Processor, alignment 0 display in the router logs.
  • Not getting any output from show commands.
  • Receiving Low on memory messages.
  • Receiving the message Unable to create EXEC – no memory or too many processes on the console.
64
Q

Some of the main reasons for memory problems are as follows:

A
  • Memory size does not support the Cisco IOS Software image
  • Memory-leak bug
  • Security-related problems
  • Memory-allocation failure at process = interrupt level error message
  • Buffer-leak bug

CCNP Troubleshooting (2 decks)

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