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Cisco 300-180 DCIT 問題練習

Troubleshooting Cisco Data Center Infrastructure 試験

最新更新時間: 2019/07/10,合計618問。

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Question No : 1
You discover that OSPF neighbors are stuck in Exstart and Exchange states. What prevents the external routes from being propagated to the leaf switches to which endpoints are attached for a given tenant?

正解:
Explanation:
Neighbors Stuck in Exstart/Exchange State
The problem occurs most frequently when attempting to run OSPF between a Cisco router and another vendor's router. The problem occurs when the maximum transmission unit (MTU) settings for neighboring router interfaces don't match. If the router with the higher MTU sends a packet larger that the MTU set on the neighboring router, the neighboring router ignores the packet.0 When this problem occurs, the output of the show ip ospf neighbor command displays output similar that shown below.
An actual recreation of this problem is described in this section.
https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13684-12.html

Question No : 2
From Cisco UCS Central, you plan to add two Cisco UCS domains that use the same name for the WWPN pool.what must you do to ensure a successful Integration?

正解:
Explanation:
The same ID can exist in different pools, but can be assigned only once. Two blocks in the same pool cannot have the same ID. https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/ucs-central/users-manual/1-3/HTML5/b_CiscoUCSCentral_UserManual_for_HTML5_UI/b_CiscoUCSCentral_UserManual_for_HTML5_UI_chapter_01011.html

Question No : 3
You are using the CISCO ACI programmatic features and you receive this error message from the REST API
Token Was invalid (Error: Token timeout)
Which option is a possible cause Of the error?

正解:
Explanation:
Symptom 3
The REST API returns the error “Token was invalid (Error: Token timeout)”
Verification
The REST API requires that a login is refreshed periodically. When logging in using the aaaLogin request, the response includes a refreshTimeoutSeconds attribute that defines how long the login cookie will remain valid. The cookie must be refreshed using a GET to api/aaaRefresh.xml or api/aaaRefresh.json prior to that timeout period. By default the timeout period is 300 seconds. If the token is not refreshed, it will expire and the REST API will return the token invalid error.
http://aci-troubleshooting-book.readthedocs.io/en/latest/rest.html

Question No : 4
Which occurrence happens during an ISSU in a single supervisor configuration?

正解:

Question No : 5
Which action do you take to determine why the interface el/10 is not present in the core VDC for configuration?

正解:
Explanation:
Each VDC also maintains an individual high-availability (HA) policy that defines the action that the system will take when a failure occurs within a VDC. Depending on the hardware configuration of the system, there are various actions that can be performed. In a single supervisor system, the VDC can be shut down, restarted, or the supervisor can be reloaded. In a redundant supervisor configuration, the VDC can be shut down, restarted, or a supervisor switchover can be initiated.
http://www.ciscopress.com/articles/article.asp?p=1609856&seqNum=5

Question No : 6
You have a Cisco APIC that has a VIC 1225 adapter installed„ Fabric discovery fails. You verify that the cabling is correct. but the LLDP fails. Which option is a possible cause of the failed fabric discovery?

正解:

Question No : 7
After moving Cisco UCS to a new data center that has a different management IP network, you discover that the KVM Stops working. What is a possible cause of the issue?

正解:

Question No : 8
After a data center is upgraded with new Cisco Nexus switches, some of the links usng multimode fiber no longer work. which type Of multmode cables are valid?

正解:
Explanation:
https://www.cisco.com/c/en/us/products/collateral/switches/nexus-6000-series-switches/guide_c07-726164.html
1-Gbps 1000BASE-SX 10-Gbps 10GBASE-SR 40-Gbps 40GBASE-SR4 40-Gbps 40GBASE-CSR4 100-Gbps 100GBASE-SR10 OM3 (50µm) 1000 300 100 300 100 OM4 (50µm) 1000 400 150 400 150

Question No : 9
In an IP storage environment, what occurs if you apply a service profile to a server that has an Ethernet-only mezzanine card?

正解:

Question No : 10
Which two protocols are important for DCBX to enable the 'no drop' classes that are needed for lossless transmission? (Choose Two.)

正解:
Explanation:
Configuring PFC and ETS
On Cisco Nexus and MDS switches, system-defined class maps for class-fcoe and class-default are enabled.
These two classes cannot be deleted. The class-fcoe is defined as no-drop (pause-enabled) and maximum
transmission unit (MTU) configuration of 2158 bytes on the Cisco Nexus 6000. On the Cisco Nexus 7000 and MDS
the MTU is set to 2112. This MTU helps to ensure the Ethernet frame will encapsulate the largest FC frame and
associated FCoE headers. All other traffic falls under class-default and may be dropped. The MTU for class-default
is set to 1500 bytes, but it is recommended to be changed to 9216 bytes. Here is the policy with the “show policymap
system:”

Question No : 11
Within Cisco UCS Manager you create a user named ccnpdc and an organization named ccnpdc. The administrator to whom the ccnpdc credentiaIs are assigned fails to access the ccnpdc organization. What must you do to provide the ccnpdc user access to the ccnpdc organization?

正解:
Explanation:
https://www.cisco.com/en/US/docs/unified_computing/ucs/sw/gui/config/guide/141/UCSM_GUI_Configuration_Guide_141_chapter9.html
Privileges give users assigned to user roles access to specific system resources and permission to perform specific tasks.

Question No : 12
Refer to the exhibit.



The output displays a failed SFP validation. What is the cause ot the failure?

正解:
Explanation:
Don't know if it helps but I have noticed on the 5020's that if you put a 1G SFP into a 1/10 capable slot then you have to enter "speed 1000" into the interface or you get the "SFP Failed Validation" error in a show interface. So you may want to try specifying the speed in the interface config.
https://supportforums.cisco.com/t5/other-data-center-subjects/nexus-7010-quot-sfp-validation-failed-quot-message-with-sfp-10g/td-p/1578882

Question No : 13
Which solution can be applied if there is communication between hosts in different VLANs over Cisco OTV and the hosts are losing connectivity?

正解:
Explanation:https://supportforums.cisco.com/t5/network-infrastructure-documents/otv-silent-host-connectivity-problem/ta-p/3122025

Question No : 14
You plan to troubleshoot EPG communication by using atomic counters What do you consider before using the atornc counters?

正解:
Explanation:
The atomic counter does not count spine proxy traffic.
https://www.cisco.com/c/en/us/support/docs/cloud-systems-management/application-policy-infrastructure-controller-apic/119418-config-atomic-00.html

Question No : 15
Refer to the exhibit.



You are configuring a Cisco APIC for access. Which task is being performed in the exhibit?

正解:
Explanation:
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/kb/b_KB_Configuring_TACACS_RADIUS_LDAP_for_ACI_Access.html

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