1. What is NEXUS? It is a binational program that allows pre-approved, low-risk travelers into Canada and the United States (U S. ) at designated air, land and marine ports of entry.
By using automated self-serve kiosks in the air, dedicated lanes in the land, and calling Telephone Reporting Centres (TRCs) in advance of arrival in the marine mode of travel, the program enables its members to enter either country more quickly and easily.
2. Orphan ports are single-attached devices that are not connected via a virtual private network (vPC), but still carry vPC VLANs. An orphan port’s connectivity may be linked to the failure or recovery of the vPC in the event of a peer-link shut or restoration. Use the show vpc orphan-ports command to see which VLANs are affected.
3. What command is used to check a Nexus 7000 Series Switch’s “HSRP Active State”? Ans: The command is either show hsrp active or show hsrp brief.
4. How Can I Prevent Seeing The Error Message “configuration Does Not Match The Port Capability” When Enabling “switchport Mode Fex-fabric”?”
5. Ans: The Scalable Feature License is the new Nexus 7000 system license that enables the incremental table sizes supported on the M-Series L Modules. How Do I Check If Xl Mode Is Enabled On A Nexus 7000 Device? The system will operate in standard mode without the license, which prevents access to any of the larger table sizes. A system may contain both XL and non-XL modules, but in order for the system to operate in XL mode, all of the modules must be XL capable, and the Scalable Feature license must be installed. The system supports mixing modules when it is operating in non-XL mode. The system defaults to the shared smallest value if the modules are part of the same system. If VDCs are used to separate the XL and non-XL, each VDC is viewed as a separate system and may operate in various modes.
You must first determine whether the Scalable Feature License is installed on the Nexus 7000 in order to determine whether the XL option is enabled. Additionally, a system may contain both XL and non-XL modules, but for the system to operate in XL mode, all modules must be XL capable.
6. In a Nexus 7000 Series Switch where VLANs are manually configured, how do I implement VTP?Answer: Cisco does not advise using VTP in data centers. The switch’s VLAN configuration will be overridden if someone connects a switch with a higher revision number to the network without altering the VTP mode on the server.
7. The show ntp peer-status command will show the status of the NTPpeers. Q: How do I check the Network Time Protocol (NTP) status on a Nexus 7000 Series Switch?
8. I can see my routes being learned using Ospf and Bgp when I issue the “show Ip Route Bgp” command. How can I check on the Nx-os which one is the backup and which one is the one that will always be used?
By default, BGP does not perform load balancing and only chooses one best path. As a result, the route indicated by the * will always be taken, unless it is destroyed, in which case any other routes will take precedence.
9. What Does “Packets Dropped Due To Ids Check Length Consistent On Module Message” Mean? Ans: Cisco NX-OS supports IDS checks that validate IP packets to ensure proper formatting. This is an enhancement beginning in 5. x.
The Ethernet frame size of a packet received by the switch is smaller than the anticipated length, which includes the IP packet length and the Ethernet header, and this causes the EEM message to be logged. Due to this circumstance, the hardware drops the packet.
Use the command show hardware forwarding ip verify module [#] to see if the IDS drops have happened since the last switch reboot.
10. Does The Nexus 7000 Support Pim-sparse Mode? And What Is The Equivalent Nx-os Command For The “ip Multicast-routing” Ios Command? Multicast is only activated in NX-OS after the PIM or PIM6 feature has been enabled on each router and the PIM or PIM6 sparse mode has been activated on each interface that will be a part of the multicast network.
11. Answer: Virtual PortChannel (vPC) is a port-channeling concept that extends link aggregation to two different physical switches. What Are The Benefits Of Vpc?
12. How Do I Avoid Receiving The “failed To Process Kickstart . Pre-upgrade Check Failed” Error Message When Upgrading The On A Nexus 7000 Series Switch? Ans: If the file name entered is incorrect, that could be one reason why you’re getting this error message.
Instead of “s1” (number 1), the file name in this instance begins with the lowercase letter “sl.”
13. Answer: Use the tac-pac bootflash:// command to direct the output of the show tech command to a file, and then gzip the file to capture the output of the show tech-support details command.
Issue the copy bootflash://showtech. To copy the file from the bootflash to the TFTP server, type switch1 tftp://.
14. During Nexus 7010 upgrade from 5. 2. 1 to 5. 2. The X-bar module in slot 4 keeps turning off after the third code. The error code is LinkNum in the message “%MODULE-2-XBAR_DIAG_FAIL: Xbar 4 reported failure due to Module asic(s) reported sync loss.” Received the error message “Trying to Resync in device 88 (device error 0x0)”? Answer: Module 2 diagnostic failures are the cause of this error message. It may be that the linecard’s connection to the X-bar is poor, which prevents the linecard from syncing. Reseated the module is typically the first step with these errors. Reseated the fabric and the module separately if that does not solve the issue.
15. What Does the Error Message %oc_usd-slot18-2-rf_crc: Oc2 Received Packets With Crc Error From Mod 6 Through Xbar Slot 5/inst 1 Mean? %oc_usd-slot18-2-rf_crc: Oc2 Received Packets With Crc Error From Mod 6 Through Xbar Slot 5/inst 1 Mean? This can be caused by multiple reasons.
16. The Nexus 7000 does not support DHCP server functionality, but it does support DHCP relay, which allows it to send DHCP requests to various DHCP servers within a VLAN. For relay, use the ip dhcp relay address x. x. x. x interface command.
Consult the Release 5 of the Cisco Nexus 7000 Series NX-OS Security Configuration Guide. On a Cisco NX-OS device, press x for more information about the Dynamic Host Configuration Protocol (DHCP).
17. On A Nexus 7000 Running Nx-os 5. Can The Decnet Be Bridged On A Vlan? Question 1(3): From a layer-2 perspective, all Nexus platforms support passing DecNet frames through the device. However, DecNet routing on the Nexus is not supported.
18. On a Nexus 7000 Series Switch, how do I enable or disable logging link status on a port-by-port basis? Ans: All interface link status (up/down) messages are recorded by default. Link status events can be configured globally or per interface. For a specific interface, the interfacecommand enables link status logging messages.
19. Is there a recommended best practice for balancing port-channel load between Nexus 1000V Series and Nexus 7000 Series Switches? Ans: No, there isn’t a recommended best practice for balancing port-channel load between Nexus 1000V Series and Nexus 7000 Series Switches. Depending on the needs of the network, you can select either a source-based model or a flow-based model.
20. An example of how to set up the destination, source IP address, and VRF for the vPC-peer-keepalive link is shown in the following sentence: How Do I Create A Peer Link For VDC And A Keepalive Link For Each Vdc?
21. I notice that one of the interfaces is consistently posting errors when I run the command “show interface counters errors.” What are the FCS-Err and Rcv-Err in the “show interface counters errors” command output? Answer: This is what was received:
22. The ERROR: Ethernet1/3: Config not allowed, as first port in the port-grp is dedicated error message is received on a Nexus 7018 when attempting to perform a “no shut” on Ethernet 1/3. Why is this? Ans: The device believes that the first port in the port-grp is in dedicated mode rather than shared mode. The other ports of a port-grp cannot be used when the first port is in dedicated mode.
23. Where can I use NEXUS in the air mode? There are 8 locations where you can use NEXUS in the air mode when entering Canada.
Additionally, a trusted traveler kiosk, accessible only to NEXUS and CANPASS Air members, is available at Billy Bishop Toronto City Airport for incoming flights.
24. Is The Cisco Asa Etherchannel Feature And The Ace 4710 Etherchannel Compatible With The Nexus 7010vpc Feature (lacp Enabled)? Ans: With regards to vPC, any device that runs the LACP (which is a standard), including ASA/ACE, is compatible with the Nexus 7000.
25. How Many OSPF Processes Can Be Operated In A Virtual Device Context (VDC)? The answer is that a VDC can support up to four (4) OSPFv2 instances.
26. The most number of syslog servers that can be configured on a Nexus 7000 Series Switch is three.
27. How big is a NEXUS card? NEXUS members can save time by using automated self-serve kiosks at nine international airports in Canada (NEXUS Air).
As an added benefit, when travelling on domestic, U. S. -bound and some international flights, NEXUS members can bypass the security screening lanes at 16 Canadian airports operated by the Canadian Air Transport Security Authority (CATSA). To enter the Trusted Traveler CATSA Security Line, participants must display their current NEXUS cards.
27. Which NX-OS release must be installed on a Cisco Nexus 7000 Series system in order for FCoE to be supported? The answer is Cisco NX-OS Release 5. 2 or later.
28. Is The Metric-type Keyword Missing From The “default-information Originate” Command On Nexus Devices? Ans: On a Nexus, use a route-map command with a set clause of metric-type type-[12] to achieve the same functionality as IOS using the default-information originate always metric-type [12] command.
As an illustration, switch(config)#route-map STAT-OSPF, permit, sequence 10 switch(config-route-map)#match interface ethernet 1/2 switch(config-route-map)#set metric-type external | internal | type-1 | type-2
29. Ans: NEXUS members can use the automated kiosks located in the U.S. airports to use the Nexus In The Air Mode. S. At participating airports, the preclearance area and the Canadian inspection services area
Instead of waiting in line to speak with a border services officer or CBP officer, members can go directly to the NEXUS self-serve kiosk.
Members must follow the audio instructions while standing in front of the self-service kiosk, looking into the adjustable camera, to have their irises photographed using iris recognition biometric technology.
30. Where Can I Use Nexus In The Marine Mode When Entering Canada? Ans: NEXUS in the marine mode is accessible at about 450 locations.
31. What Is Iris Recognition Biometric Technology? The iris, which is the colored ring around the eye’s pupil, is recognized by this technology for its distinctive patterns. The technology can read all 266 of the human iris’ distinctive features. It is safe, secure and non-invasive.
32. How do I check which features are turned on in NX-OS 4 on my Nexus 7000 Series Switch? 2? Ans: To confirm, use the show feature command.
33. The Nexus 7000 has a loop prevention method that drops traffic traversing the peer link (meant for a vPC peer link) when there are no failed vPC ports or links, which explains why vPC does not block either of the vPC uplinks. The rule is straightforward: even if a vPC lacks the original VLAN, a packet cannot exit any of its ports if it crosses the vPC peer link.
34. What does iris recognition biometric technology do? The iris is the colored ring that surrounds the pupil of the eye. It can be recognized by its distinctive patterns. The technology can read all 266 of the human iris’ distinctive features. It is safe, secure and non-invasive.
35. How do I join NEXUS? Answer: Those interested in joining NEXUS must:
36. IOS-NXOS Migration Tool has been created by Cisco to facilitate quick configuration conversion on Cisco 6500 series to Nexus series OS. Is there a tool available for the Nexus platform?
37. Does it cost anything to apply for NEXUS? Answer: Yes. There is a $50 Canadian or U.S. processing fee that is non-refundable. S. funds.
38. Where can I use NEXUS in the land mode when entering Canada? There are 21 locations where you can use NEXUS in the land mode.
39. Which Nexus 7000 modules are FCoE-compatible? The Cisco Nexus 7000 Series 32-Port 1 and 10 Gigabit Ethernet Module is FCoE-compatible. The part number of the product is N7K-F132XP-15.
40. Where Can I Use Nexus In The Marine Mode When Entering Canada? Ans: NEXUS in the marine mode is accessible at about 450 locations.
41. Does The Nexus 7000 Support Pim-sparse Mode? And What Is The Equivalent Nx-os Command For The “ip Multicast-routing” Ios Command? Multicast is only activated in NX-OS after the PIM or PIM6 feature has been enabled on each router and the PIM or PIM6 sparse mode has been activated on each interface that will be a part of the multicast network.
Note: Browse latest Nexs Interview Questions and Nexus Tutorial. You can view information about Nexus – DataScience Online Training and Nexus Training Videos here. Contact +91 988 502 2027 for more information.
CISCO NEXUS Interview Questions and Answers | Basics of Nexus Switches |
Cisco Nexus Interview Questions and Answers
Here are the top 15 Cisco nexus interview questions. We at PyNet Labs have chosen to divide these questions into two groups in response to widespread requests.
Nexus vPC Interview Questions and Answers
Answer: A feature of Cisco Nexus Switches called Virtual Port-Channel (vPC) allows us to logically combine the links of two different chassis. The primary distinction between it and VSS is that vPC logically bundles the links. For management and configuration, VSS, on the other hand, creates a single logical switch with a single logical control plane.
We must independently set up and maintain VPC on both switches.
Benefits of vPC:
Question 2 – What are the components of vPC?
Answer – The main components of vPC are as follows:
6. In a Nexus 7000 Series Switch where VLANs are manually configured, how do I implement VTP?Answer: Cisco does not advise using VTP in data centers. The switch’s VLAN configuration will be overridden if someone connects a switch with a higher revision number to the network without altering the VTP mode on the server.
22. The ERROR: Ethernet1/3: Config not allowed, as first port in the port-grp is dedicated error message is received on a Nexus 7018 when attempting to perform a “no shut” on Ethernet 1/3. Why is this? Ans: The device believes that the first port in the port-grp is in dedicated mode rather than shared mode. The other ports of a port-grp cannot be used when the first port is in dedicated mode.
37. Does it cost anything to apply for NEXUS? Answer: Yes. There is a $50 Canadian or U.S. processing fee that is non-refundable. S. funds.
You must first determine whether the Scalable Feature License is installed on the Nexus 7000 in order to determine whether the XL option is enabled. Additionally, a system may contain both XL and non-XL modules, but for the system to operate in XL mode, all modules must be XL capable.
Consult the Release 5 of the Cisco Nexus 7000 Series NX-OS Security Configuration Guide. On a Cisco NX-OS device, press x for more information about the Dynamic Host Configuration Protocol (DHCP).
FAQ
What questions are asked in a nexus interview?
During the NEXUS interview, questions like “Why do you want the Nexus card? “, “How often do you plan to use the NEXUS pass? “, and “Where do you think you will travel in Canada/the United States?” are frequently asked.
What is vPC and VDC in Nexus?
VDC – Virtual Device Content. On a pair of 7K hardware, 7K can support up to four VDCs. You can sign different hardware resources to the different VDCs. VPC – Virtual PortChannel. Which very like VSS (Virtual Switch).
Is Nexus a router or switch?
The Cisco Nexus series switches are fixed port, modular network switches created specifically for data centers. On January 28, 2008, Cisco Systems unveiled the Nexus Series of switches.
Is Nexus 9k a router?
The Cisco Nexus 9000 series, the result of Cisco’s Insieme spin-in, is more than just another fast router; it represents a shift in the way premium routers are created.
