[350-401]CCNP ENCOR│BE NE ENG

2021-04-03
2021-04-04
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[350-401]Difference between FIB andRIB part.1

Question Which of the following is correct about the difference between RIB and FIB? Fib is based on THERIB. Rib maintains fib mirror image. RIB is used to determine switching based on ip source prefix. The FIB stores all IP routing information. See answers (1) Commentary FIB(Forwarding Information Base) A FIB is a table that contains the transfer information generated when the device has enabled the switching mechanism Cisco Express Forwarding (CEF). A FIB contains a prefix from an IP routing table or global RIB that is structured in a way that is optimized for forwarding. When routing or topology changes occur on the network, the IP routing table is updated and these changes are reflected in the FIB. The FIB holds the next-hop address information based on the information in the IP routing table. RIB（Routing Information Base） A central repository of routes containing L3 reachability information and source IP addresses or prefixes. RIB is also known as a routing table. <参考>https://www.cisco.com/c/ja_jp/td/docs/cian/ios/ios15-1s/cg/013/isw-15-1s-cg/cef-overview.html#16041</参考>

2021-03-29
2021-04-04
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[350-401]Cisco EtherChannel PAgP Mode Combination

Question Which of the following combinations of PAgP modes prevents etherChannel from forming? auto/desirable desirable/desirable desiravle/auto auto/auto See answers (4) Commentary Combination of EtherChannel (PAgP) operating modes Cisco’s proprietary EtherChannel negotiation mechanism PAgP has two modes to set up the interface. Desirable Enable PAgP unconditionally. Start sending negotiation messages to other ports. Auto Enable PAgP only when a PAgP device is detected. In other words, it waits for an on-the-other request and responds to a request for PAgP negotiation. This reduces the transmission of PAgP packets. Auto and Auto do not start negotiating PAgP from the above mode. A combination of Desirable/Desirable and Desirable/Auto is required to use PAgP. Therefore, the combination that prevents formation is ④.

2021-03-25
2021-04-04
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[350-401] Difference between FIB and RIB part.1

Question Which of the following is correct about the difference between RIB and FIB? FIB creates data based on RIB. RIB maintains the mirror image of FIB. The RIB is used to make a switch decision based on the IP source prefix. All IP routing information is stored in the FIB. See Answer ① Commentary FIB(Forwarding Information Base) FIB is a table that stores transfer information generated when the switching mechanism CEF (Cisco Express Forwarding) is enabled on the device. The FIB contains prefixes from IP routing tables or global RIBs that are structured in a way that is optimized for forwarding. When a routing or topology change occurs in the network, the IP routing table is updated and these changes are reflected in his FIB. The FIB holds the next hop address information based on the information in the IP routing table. RIB（Routing Information Base） A central repository for routes containing L3 reachability information and source IP addresses or prefixes. RIB is also known as the routing table. <reference>https://www.cisco.com/c/ja_jp/td/docs/cian/ios/ios15-1s/cg/013/isw-15-1s-cg/cef-overview.html#16041

2021-03-17
2021-04-04
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[350-401]Exclusive control by Python script

Question The network administrator has prepared a Python script to configure a network device running based on IOS XE. The administrator is worried that a colleague will make configuration changes to the device while the script is running. What is the Client Manager action to prevent colleagues from making changes to the device while the script is running? m.lock (config = ‘running’) m.lock (target = ‘running’) m.freeze (config = ‘running’) m.freeze (target = ‘running’) See Answer ② Commentary Python lock() object It is a Python object used for exclusive control when performing parallel processing. Specify the specified resource in () and control (block) the process when the executed work / command matches. <reference>Python Documentation (threading) IOS NETCONF target /config/ Resources in the NETCONF configuration store <rpc message-id="101" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"> <lock> <target> <running/> </target> </lock> </rpc> <reference> Cisco Programmability Guide

2021-03-16
2021-04-04
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[350-401]Exclusive control with Python scripts

Question Network administrators are preparing Python scripts to set up network devices running ONS XE-based. Administrators are concerned about coworkers changing settings on their devices while the script is running. What is the client manager’s action to prevent colleagues from make changes to the device while the script is running? m.lock (config = ‘running’) m.lock (target = ‘running’) m.freeze (config = ‘running’) m.freeze (target = ‘running’) See answers (2) Commentary Python lock() object It is a Python object used for exclusive control when parallel processing. () specifies the specified resource and controls (blocks) the processing if the work/command performed matches. <参考>Python Documentation (threading)</参考> IOS NETCONF target /config/ Resources in the NETCONF Configuration Store <rpc message-id="101" xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"> <lock> <target> <running/> </target> </lock> </rpc> <参考> Cisco Programmability Guide</参考>

2021-03-11
2021-04-04
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[350-401]Impact of log configure commands

Question A system administrator enabled Syslog and executes the following command on the router. Which syslog levels will be affected? router(config)#logging rate-limit 500 except 3 Log transmission is limited to 500 messages per minute, except for the emergency log level only. Log transmission is limited to 500 messages per second, except for log levels 3 only. Log transmission is limited to 500 messages per second, except for the error log level through the emergency log level. Log transmission is limited to 500 messages per minute, except for the error log level only. Log transmission is limited to 500 messages per second, except for the emergency log level only. See Answer ③ Commentary logging rate-limit command This command allows you to rate limit the number of logs generated on the device. It is very effective in an environment where a large amount of logs are generated, and the effect on the CPU load of the router can be mitigated. In addition, since it is possible to reduce the number of logs sent to the Syslog server as in this case, it is possible to secure the bandwidth of the network environment. Router(config)#logging rate-limit ? <1-10000> Messages per second all Rate […]

2021-03-11
2021-04-04
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[350-401]Impact of logging commands

Question The administrator enabled Syslog and set the following command on the router: What is the impact at the Syslog level? router(config)#logging rate-limit 500 except 3 Log submissions are limited to 500 per minute, and only the efficiency log level is not sent. Log submissions are limited to 500 per second and only log level 3 is not sent. Log submissions are limited to 500 per second and are not sent from the emergeency log level to the error log level. Log submissions are limited to 500 per minute and error log levels are not sent. Log submissions are limited to 500 per second, and only the efficiency log level is not sent. See answers (3) Commentary Giving rate-limit command This command can rate-limit the number of logs generated on the device. It is very effective in environments where large amounts of logs are generated, and the impact on the CPU load of the router can be mitigated. In addition, since it is possible to reduce the number of log transmissions to the Syslog server as in this time, it is possible to secure bandwidth in the [all / console]network environment. you can choose to adapt the restrictions to all […]