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Miscellaneous Questions

January 23rd, 2021 in ENCOR 350-401 Go to comments

Question 1

Explanation

Although some Cisco webpages (like this one) mentioned about “logging synchronous” command in global configuration mode, which means “Router(config)#logging synchronous”, but in fact we cannot use it under global configuration mode. We can only use this command in line mode. Therefore answer C is better than answer A.

Let’s see how the “logging synchronous” command affect the typing command:

Without this command, a message may pop up and you may not know what you typed if that message is too long. When trying to erase (backspace) your command, you realize you are erasing the message instead.

without_logging_synchronous.jpg

With this command enabled, when a message pops up you will be put to a new line with your typing command which is very nice:

with_logging_synchronous.jpg

Question 2

Explanation

The Link Management Protocol (LMP) performs the following functions:
+ Verifies link integrity by establishing bidirectional traffic forwarding, and rejects any unidirectional links
+ Exchanges periodic hellos to monitor and maintain the health of the links
+ Negotiates the version of StackWise Virtual header between the switches StackWise Virtual link role resolution

Reference: https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9000/nb-06-cat-9k-stack-wp-cte-en.html

Question 3

Explanation

Syslog levels are listed below:

Level Keyword Description
0 emergencies System is unusable
1 alerts Immediate action is needed
2 critical Critical conditions exist
3 errors Error conditions exist
4 warnings Warning conditions exist
5 notification Normal, but significant, conditions exist
6 informational Informational messages
7 debugging Debugging messages

Number “3” in “%LINK-3-UPDOWN” is the severity level of this message so in this case it is “errors”.

Question 4

Explanation

The application residing on Device 1 originates an RSVP message called Path, which is sent to the same destination IP address as the data flow for which a reservation is requested (that is, 10.60.60.60) and is sent with the “router alert” option turned on in the IP header. The Path message contains, among other things, the following objects:

–The “sender T-Spec” (traffic specification) object, which characterizes the data flow for which a reservation will be requested. The T-Spec basically defines the maximum IP bandwidth required for a call flow using a specific codec. The T-Spec is typically defined using values for the data flow’s average bit rate, peak rate, and burst size.

Reference: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/9x/uc9x/cac.html

Question 5

Explanation

Cisco IOS Nonstop Forwarding(NSF) always runs with stateful switchover (SSO) and provides redundancy for Layer 3 traffic.

Reference: https://www.cisco.com/en/US/docs/switches/lan/catalyst3850/software/release/3se/consolidated_guide/b_consolidated_3850_3se_cg_chapter_01101110.pdf

Comments
  1. Ciscolad
    March 18th, 2020

    Question 7
    A network administrator is implementing a routing configuration change and enables routing debugs to track routing behavior during the change. The logging output on the terminal is interrupting the command typing process. Which two actions can the network administrator take to minimize the possibility of typing commands incorrectly? (Choose two)

    A. Configure the logging synchronous global configuration command
    B. Configure the logging delimiter feature
    C. Configure the logging synchronous command under the vty
    D. Press the TAB key to reprint the command in a new line
    E. Increase the number of lines on the screen using the terminal length command

    A is one of the answer but cannot figure out what the other one is? either C or D seems these can be correct.

    C – Use the line vty line-number command to specify which vty lines are to have synchronous logging enabled
    D – If you cannot remember a complete command name, or if you want to reduce the amount of typing you have to perform, enter the first few letters of the command, then press the Tab key. The command line parser will complete the command if the string entered is unique to the command mode. If your keyboard does not have a Tab key, press Ctrl-I instead.

    Anyone can shine a light on this matter?

  2. Ciscolad
    March 21st, 2020

    Which two GRE features are configured to prevent fragmentation? (Choose two)
    A. TCP window size
    B. TCP MSS
    C. IP MTU
    D. DF bit Clear
    E. MTU ignore
    F. PMTUD

    Answer: B F

    I did the exam and got this question , there was no option for PMTUD, answer may fall on IP MTU

  3. brad
    March 21st, 2020

    @ Ciscolad

    Are the questions in this premium membership enough to pass the exam?

  4. Aussie
    April 27th, 2020

    Can anyone please check question 7?

  5. Manosh
    May 12th, 2020

    Question 7 answer is correct:

    this is how it looks like on the running configuration on a router when its configured:

    line con 0
    exec-timeout 0 0
    privilege level 15
    logging synchronous <<<
    line aux 0
    exec-timeout 0 0
    privilege level 15
    logging synchronous <<
    line vty 0 4
    logging synchronous <<
    login

    =============================================
    there is no option to configure logging synchronous under global config:

    R2(config)#logging ?
    Hostname or A.B.C.D IP address of the logging host
    buffered Set buffered logging parameters
    buginf Enable buginf logging for debugging
    cns-events Set CNS Event logging level
    console Set console logging parameters
    count Count every log message and timestamp last occurrence
    exception Limit size of exception flush output
    facility Facility parameter for syslog messages
    filter Specify logging filter
    history Configure syslog history table
    host Set syslog server IP address and parameters
    monitor Set terminal line (monitor) logging parameters
    on Enable logging to all enabled destinations
    origin-id Add origin ID to syslog messages
    rate-limit Set messages per second limit
    reload Set reload logging level
    server-arp Enable sending ARP requests for syslog servers when
    first configured
    source-interface Specify interface for source address in logging
    transactions
    trap Set syslog server logging level
    userinfo Enable logging of user info on privileged mode enabling

  6. Anonymous
    May 12th, 2020

    Question 7 answer is correct:

    this is how it looks like on the running configuration on a router when its configured:

    line con 0
    exec-timeout 0 0
    privilege level 15
    logging synchronous <<<
    line aux 0
    exec-timeout 0 0
    privilege level 15
    logging synchronous <<
    line vty 0 4
    logging synchronous <<
    login

    =============================================
    there is no option to configure logging synchronous under global config:

    R2(config)#logging ?
    Hostname or A.B.C.D IP address of the logging host
    buffered Set buffered logging parameters
    buginf Enable buginf logging for debugging
    cns-events Set CNS Event logging level
    console Set console logging parameters
    count Count every log message and timestamp last occurrence
    exception Limit size of exception flush output
    facility Facility parameter for syslog messages
    filter Specify logging filter
    history Configure syslog history table
    host Set syslog server IP address and parameters
    monitor Set terminal line (monitor) logging parameters
    on Enable logging to all enabled destinations
    origin-id Add origin ID to syslog messages
    rate-limit Set messages per second limit
    reload Set reload logging level
    server-arp Enable sending ARP requests for syslog servers when
    first configured
    source-interface Specify interface for source address in logging
    transactions
    trap Set syslog server logging level
    userinfo Enable logging of user info on privileged mode enabling

  7. randy227
    May 26th, 2020

    Question 7:

    Since the question is asking to minimize the possibility of typing commands incorrectly, I think its more basic than people are thinking. When typing in the command-line, we want to make sure that we don’t make mistakes that cause us to retype or correct ourselves.

    We understand that “C. Configure the logging synchronous command under the vty” is correct. It can be confirmed directly on router. This configuration will keep your most recent configuration on the prompt constantly showing even when terminal monitoring displays events.

    When typing commands in command-line, we can use TAB to auto-fill the command so we don’t have to mistype the words. Therefore “D” would be correct. I think its that simple. Let me know if I’m missing anything.

  8. Jay
    June 21st, 2020

    please share question #10.

  9. NET-Student
    October 26th, 2020

    Can anyone check Question 10?
    it says the answer is There is instability in the network due to route flapping but the explanation is misconfiguration

  10. digitaltutq
    October 26th, 2020

    @NET-Student: Q.10 answers are correct. “Route flapping” in the explanation mentions about answer C.

  11. magic
    January 9th, 2021

    Question 10 answer

    E. The tunnel destination is being routed out of the tunnel interface

    is not correct in my opinion. Tunnel destination has to be routed out of tunnel interface to avoid recursive routing.
    Aren’t correct answers:
    A. Incorrect destination IP addresses are configured on the tunnel – in case configured address is routed inside tunnel
    C. There is instability in the network due to route flapping – in case we loose valid routing entry due to flapping

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