Cisco
Exam Name: Troubleshooting and Maintaining Cisco IP Networks
642-832 PDF
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Question:
1
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The following commands are
issued on a Cisco Router:
Router(configuration)#access-list
199 permit tcp host 10.1.1.1 host 172.16.1.1
Router(configuration)#access-list
199 permit tcp host 172.16.1.1 host 10.1.1.1
Router(configuration)#exit
Router#debug ip packet 199
What will the debug output
on the console show?
A. All IP packets passing
through the router
B. Only IP packets with
the source address of 10.1.1.1
C. All IP packets from
10.1.1.1 to 172.16.1.1
D. All IP Packets between
10.1.1.1 and 172.16.1.1
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Answer: D
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Explanation:
In this example, the
“debug ip packet” command is tied to access list 199, specifying which IP
packets should be debugged. Access list 199 contains two lines, one going from
the host with IP address 10.1.1.1 to 172.16.1.1 and the other specifying all
TCP packets from host 172.16.1.1 to 10.1.1.1.
Incorrect Answers:
: Only the packets
specified in access list 199 will be debugged, not all packets.
: Access list 199 is an
extended access list, which specifies that both the source and destination IP
addresses must match. In this case, it is all TCP traffic to and from 10.1.1.1
to 172.16.1.1.
: There are two separate
lines in access list 199, the first does indeed match all TCP packets from
10.1.1.1 to 172.16.1.1, but the second line also include traffic the other way,
from 172.16.1.1 to 10.1.1.1.
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Question:
2
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What level of logging is
enabled on a Router where the following logs are seen?
%LINK-3-UPDOWN: Interface
FastEthernet0/1, changed state to up
%LINEPROTO-5-UPDOWN: Line
protocol on Interface FastEthernet0/1, changed state to up
A. alerts
B. critical
C. errors
D. notifications
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Answer: D
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Explanation:
Cisco routers, switches,
PIX and ASA firewalls prioritize log messages into 8 levels (0-7), as shown
below:
When you enable logging
for a specific level, all logs of that severity and greater (numerically less)
will be logged. In this case we can see that logging level of 3 (as seen by the
3 in “LINK-3-UPDOWN”) and level 5 (as seen by the 5 in “LINEPROTO-5-UPDOWN”)
are shown, which means that logging level 5 must have been configured. As shown
by the table, logging level 5 is Notifications.
Incorrect Answers:
: Alerts is logging level
1, and all levels 5 and below (more severe) are being logged.
: Critical is logging
level 2, and all levels 5 and below are being logged.
: Errors is logging level
3, and all levels 5 and below are being logged.
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Question:
3
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You have the followings
commands on your Cisco Router:
ip ftp username admin
ip ftp password backup
You have been asked to
switch from FTP to HTTP. Which two commands will you use to replace the
existing commands?
A. ip http username admin
B. ip http client username
admin
C. ip http password backup
D. ip http client password
backup
E. ip http server username
admin
F. ip http server password
backup
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Answer: B, D
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Explanation:
Configuring the HTTP
Client Perform this task to enable the HTTP client and configure optional
client characteristics.
The standard HTTP 1.1
client and the secure HTTP client are always enabled. No commands exist to disable
the HTTP client. For information about configuring optional characteristics for
the HTTPS client, see the HTTPS-HTTP Server and Client with SSL 3.0, Release
12.2(15)T, feature module.
SUMMARY STEPS
1. enable
2. configure terminal
3. ip http client cache
{ager interval minutes | memory {file file-size-limit | pool pool-size-limit}
4. ip http client
connection {forceclose | idle timeout seconds | retry count | timeout seconds}
5. ip http client password
password
6. ip http client
proxy-server proxy-name proxy-port port-number
7. ip http client response
timeout seconds
8. ip http client
source-interface type number
9. ip http client username
username
Incorrect Answers:
: The correct sytax is “ip
http client username admin” not “ip http username admin”
: The correct syntax is
“ip http client password backup” not “ip http password backup”
: “ip http server”
commands are not valid for this configuration task.
Reference: HTTP 1.1 Web
Server and Client
http://www.cisco.com/en/US/docs/ios/netmgmt/configuration/guide/nm_http_web.html
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Question:
4
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You have 2 NTP servers in
your network - 10.1.1.1 and 10.1.1.2. You want to configure a Cisco router to
use 10.1.1.2 as its NTP server before falling back to 10.1.1.1. Which commands
will you use to configure the router?
A. ntp server 10.1.1.1
ntp server 10.1.1.2
B. ntp server 10.1.1.1
ntp server 10.1.1.2
primary
C. ntp server 10.1.1.1
ntp server 10.1.1.2 prefer
D. ntp server 10.1.1.1
fallback
ntp server 10.1.1.2
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Answer: C
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Explanation:
Preferred server
A router can be configured
to prefer an NTP source over another. A preferred server's responses are
discarded only if they vary dramatically from the other time sources.
Otherwise, the preferred server is used for synchronization without
consideration of the other time sources. Preferred servers are usually
specified when they are known to be extremely accurate. To specify a preferred
server, use the prefer keyword appended to the ntp server command. The
following example tells the router to prefer TimeServerOne over TimeServerTwo:
Router#config terminal
Enter configuration
commands, one per line. End with CNTL/Z.
Router(config)#ntp server
TimeServerOne prefer
Router(config)#ntp server
TimeServerTwo
Router(config)#^Z
Incorrect Answers:
: In this case 10.1.1.1
will be used as the primary NTP server, and 10.1.1.2 is configured for
redundancy and will be used if 10.1.1.1 is unreachable.
: ntp server 10.1.1.2
primary is not a valid command
: ntp server 10.1.1.1
fallback is not a valid command.
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Question:
5
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The following command is
issued on a Cisco Router:
Router(configuration)#logging
console warnings
Which alerts will be seen
on the console?
A. Warnings only
B. debugging,
informational, notifications, warnings
C. warnings, errors,
critical, alerts, emergencies
D. notifications,
warnings, errors
E. warnings, errors,
critical, alerts
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Answer: C
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Explanation:
Cisco routers prioritize
log messages into 8 levels (0-7), as shown below:
When you enable logging
for a specific level, all logs of that severity and greater (numerically less)
will be logged. In this case, when you enable console logging of warning
messages (level 4), it will log levels
0-4, making the correct answer warnings, errors, critical, alerts, and
emergencies.
Incorrect Answers:
: When you enable logging
using a value such as warning, all message of that severity and greater
(numerically less) will also be logged.
: Only the warnings and
other more severe messages will be logged, so in this case levels 0-4 will be
logged.
: The correct answer is
warnings, errors, critical, alerts, and emergencies.
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