Cisco Nexus Switches Interview Questions with Answers
Question: 1. What Is Nexus?
Answer:
NEXUS is a bi-countrywide, Canada-United States software for pre-permitted, low-risk visitors entering Canada or the US (U.S.) at detailed air, land and marine ports of access.
The program allows its members to go into both u . S . More speedy and without difficulty by means of the usage of automated self-serve kiosks within the air mode of tour, committed lanes inside the land mode of tour, and via calling Telephone Reporting Centres (TRCs) previous to arrival in the marine mode of journey.
Question: 2. What Are The Benefits Of Using Nexus?
Answer:
NEXUS participants avoid lengthy line-united statesand save time using computerized self-serve kiosks at nine Canadian worldwide airports (NEXUS Air).
As an brought gain, while touring on domestic, U.S.-bound, and select international flights, NEXUS contributors can be expedited through Canadian Air Transport Security Authority (CATSA) airport security screening lanes located at 16 Canadian airports. Members have to gift their valid NEXUS card to get right of entry to the Trusted Traveller CATSA Security Line.
Members also enjoy a brief and simplified entry manner the usage of devoted lanes at 21 targeted land border crossings.
When arriving with the aid of boat, members travelling to over 450 marine web sites in Canada can record with the aid of telephone to a TRC between 30 minutes and 4 hours earlier than they come.
NEXUS permits Canadian and U.S. Border officials to recognition their efforts on unknown and doubtlessly better-chance travelers and their goods.
Question: 3. What Is Iris Recognition Bio Metric Technology?
Answer:
Iris popularity biometric generation identifies the specific patterns of the iris (the colored ring across the pupil of the attention). The technology reads each of the 266 particular traits inside the human iris. It is safe, secure and non-invasive.
Question: four. What Is The Size Of A Nexus Card?
Answer:
A NEXUS card is about the identical length as a popular credit score card or driver’s licence.
Question: five. How Does Nexus In The Air Mode Work?
Answer:
NEXUS individuals can use the automatic kiosks positioned inside the U.S. Preclearance place and the Canadian inspection offerings region at taking part airports.
Members can proceed at once to the NEXUS self-serve kiosk and do now not want to go through the standard queue to speak to a border offerings officer or CBP officer.
Members stand in the front of the self-serve kiosk and look into the adjustable camera and follow the audio instructions in order that their irises can be photographed the use of iris recognition biometric technology.
Once the CBSA or CBP has showed that the picture of the irises fits the only on document, the member will use the touch screen to reply standard customs and immigration questions.
NEXUS participants living in Canada can use a Traveller Declaration Card (TDC) to declare goods and pay for any responsibilities or taxes while coming into Canada. Members definitely deposit a TDC in a cozy TDC container with no trouble located near a self-serve kiosk. Any obligations or taxes owing may be accumulated thru the credit card facts supplied at the TDC.
Question: 6. Where Is Nexus In The Air Mode Available?
Answer:
NEXUS inside the air mode is to be had at eight locations while coming into Canada.
In addition, please word that a depended on vacationer kiosk is likewise available at Billy Bishop Toronto City Airport, for incoming flights only for use with the aid of individuals of NEXUS and CANPASS Air.
Question: 7. Where Is Nexus In The Marine Mode Available?
Answer:
NEXUS within the marine mode is available at approximately 450 places while entering Canada.
Question: eight. Why Does Vpc Not Block Either Of The Vpc Uplinks?
Answer:
Nexus 7000 has a loop prevention technique that drops traffic traversing the peer link (destined for a vPC peer link) while there are no failed vPC ports or links. The rule is straightforward: if the packet crosses the vPC peer link, it could not go out any port in a vPC although that vPC does no longer have the authentic VLAN.
Question: nine. Is There A Tool Available For Configuration Conversion On Cisco 6500 Series To The Nexus Platform?
Answer:
Cisco has evolved the IOS-NXOS Migration Tool for quick configuration conversion on Cisco 6500 collection to the Nexus series OS.
Question: 10. What Are Orphan Ports?
Answer:
Orphan ports are unmarried attached devices that aren’t connected through a vPC, however nonetheless carry vPC VLANs. In the example of a peer-hyperlink close or recovery, an orphan port’s connectivity may be certain to the vPC failure or recovery method. Issue the show vpc orphan-ports command with a purpose to perceive the impacted VLANs.
Question: 11. What Is The Minimum Nx-os Release Required To Support Fcoe In The Nexus 7000 Series Switches?
Answer:
FCoE is supported on Cisco Nexus 7000 Series systems running Cisco NX-OS Release five.2 or later.
Question: 12. On A Nexus, Is The Metric-kind Keyword Not Available In The “default-facts Originate” Command?
Answer:
On a Nexus, use a course-map command with a fixed clause of metric-type type-[½] a good way to have the same functionality as in IOS the use of the default-statistics originate always metric-type [½] command.
For example:
transfer(config)#course-map STAT-OSPF, permit, collection 10switch(config-route-map) #suit interface ethernet 1/2switch(config-course-map) #set metric-kind outside internal type type-2
Question: thirteen. What Is Vpc And What Are Its Benefits?
Answer:
Virtual PortChannel (vPC) is a port-channeling idea that extends hyperlink aggregation to 2 separate physical switches.
Benefits of vPC encompass:
- Utilizes all available uplink bandwidth
- Allows the introduction of resilient Layer 2 topologies primarily based on hyperlink aggregation
- Eliminates the dependence of Spanning Tree Protocol in Layer 2 access distribution layer(s)
- Enables obvious server mobility and server excessive availability (HA) clusters
- Scales to be had Layer 2 bandwidth
- Simplifies community layout
- Dual-homed servers can operate in active-lively mode
- Faster convergence upon hyperlink failure
- Improves convergence time when a unmarried tool fails
- Reduces capex and opex
Question: 14. How Do I Create A Peer Link For Vdc And A Keepalive Link For Each Vdc?
Answer:
Configure the vPC Keepalive Link and Messages
This example demonstrates how to configure the vacation spot, supply IP address, and VRF for the vPC-peer-keepalive hyperlink:
- switch# configure terminal
- transfer(config)# function vpc
- switch(config)# vpc area a hundred
- transfer(config-vpc-area)# peer-keepalive vacation spot 172.168.1.2 supply
- 172.168.1.1 vrf vpc-keepalive
- Create the vPC Peer Link
- This example demonstrates the way to configure a vPC peer link:
- transfer# configure terminal
- switch(config)# interface port-channel 20
- transfer(config-if)# vpc peer-hyperlink
- switch(config-vpc-domain)#
Question: 15. What Does The %eem_action-6-tell: Packets Dropped Due To Ids Check Length Consistent On Module Message Mean?
Answer:
Cisco NX-OS supports Intrusion Detection System (IDS) assessments that validate IP packets to make certain right formatting. This is an enhancement beginning in five.X.
The EEM message is being logged due to the fact a packet is obtained with the aid of the switch where the Ethernet body length is shorter than the predicted length to include the IP packet duration plus the Ethernet header. The packet is dropped by means of the hardware due to this situation.
In order to affirm that the IDS drops befell because the closing switch reboot, difficulty the show hardware forwarding ip verify module [#] “.
Question: 16. How Many Syslog Servers Can Be Added To A Nexus 7000 Series Switch?
Answer:
The maximum range of syslog servers configured is three.
Question: 17. Is Nexus 7010vpc Feature (lacp Enabled) Compatible With The Cisco Asa Etherchannel Feature And With Ace 4710 Etherchannel?
Answer:
With recognize to vPC, any tool that runs the LACP (that’s a wellknown), is like minded with the Nexus 7000, which include ASA/ACE.
Question: 18. How Many Ospf Processes Can Be Run In A Virtual Device Context (vdc)?
Answer:
There can be up to 4 (4) instances of OSPFv2 in a VDC.
Question: 19. Which Nexus 7000 Modules Support Fibre Channel Over Ethernet (fcoe)?
Answer:
The Cisco Nexus 7000 Series 32-Port 1 and 10 Gigabit Ethernet Module assist FCoE. The part variety of the product is N7K-F132XP-15.
Question: 20. On A Nexus, Is The Metric-type Keyword Not Available In The “default-information Originate” Command?
Answer:
On a Nexus, use a direction-map command with a fixed clause of metric-type kind-[½] a good way to have the equal capability as in IOS the use of the default-statistics originate continually metric-type [½] command.
For example:
switch(config)#direction-map STAT-OSPF, permit, collection 10
transfer(config-course-map)#healthy interface ethernet 1/2
transfer(config-course-map)#set metric-kind external internal kind-1 kind-2
Question: 21. How Do I Redistribute Connected Routes Into An Ospf Instance On A Nexus 7010 With A Defined Metric?
Answer:
In NX-OS, a course-map is usually required when redistributing routes into an OSPF example, and you’ll also use this direction-map to set the metric. Further, subnet redistribution is by using default, so you do not should upload the subnets key-word.
For example:
switch(config)#get right of entry to-listing 101 allow ip any
switch(config)#get right of entry to-list a hundred and one allow ip any
switch(config)#access-listing one zero one allow ip any
switch(config)#get entry to-listing one hundred and one deny any
!
Router(config)# direction-map direct2ospf permit 10
Router(config-route-map)# fit ip address 101
Router(config-route-map)# set metric <100>
Router(config-course-map)# set metric-type kind-1
!
Transfer(config)#router ospf 1
switch(config-router)#redistribute direct path-map direct2ospf
Question: 22. What Is The Equivalent Nx-os Command For The “ip Multicast-routing” Ios Command, And Does The Nexus 7000 Support Pim-sparse Mode?
Answer:
The command is characteristic pim. In NX-OS, multicast is enabled handiest after enabling the PIM or PIM6 function on every router after which allowing PIM or PIM6 sparse mode on each interface that you want to take part in multicast.
For instance:
switch(config)#feature pim
switch(config)#interface Vlan[536]
transfer(config-if)#ip pim sparse-mode
Question: 23. When I Issue The “display Ip Route Bgp” Command, I See My Routes Being Learned Via Ospf And Bgp. How Can I Verify On The Nx-os Which One Will Always Be Used And Which One Is A Backup?
Answer:
Here is what is acquired:
Nexus_7010#show ip direction bgp
IP Route Table for VRF “default”
‘*’ denotes best ucast subsequent-hop
‘**’ denotes high-quality mcast next-hop
‘[x/y]’ denotes [preference/metric]
172.20.62.Zero/23, ubest/mbest: 1/0
*via 10.194.A hundred and sixty.2, [20/0], 18:53:35, bgp-[AS-Number], inner, tag [Number]
thru 10.194.Sixteen.Five, Vlan116, [110/1043], 18:43:51, ospf-1, intra
172.20.122.0/23, ubest/mbest: 1/zero
*via 10.194.160.2, [20/0], 18:53:35, bgp-[AS-Number], internal, tag [Number]
thru 10.194.Sixteen.5, Vlan116, [110/1041], 18:forty three:fifty one, ospf-1, intra
By default, BGP selects most effective a unmarried best course and does no longer carry out load balancing. As a result, the direction marked with the * will always be used, except it goes down, at which point any remaining routes will become the preferred course.
Question: 24. How Do I Avoid Receiving The “failed To Process Kickstart Image. Pre-improve Check Failed” Error Message When Upgrading The Image On A Nexus 7000 Series Switch?
Answer:
One capacity cause for receiving this mistake message is if the file name distinctive isn’t correct.
For instance:
transfer#deploy all kickstart bootflash:n7000-sl-kickstart.Five.1.1a.Bin system
bootflash:n7000-sl-dk9.5.1.1a.Bin
In this case, the file name includes “sl” (lowercase letter l) in place of “s1” (no 1).
Question: 25. How Can I Avoid Receiving The “configuration Does Not Match The Port Capability” Error Message When Enabling “switchport Mode Fex-fabric”?
Answer:
This blunders message is generated due to the fact the port isn’t always FEX capable:
N7K-2(config)#interface ethernet 9/five
N7K-2(config-if)#switchport mode fex-fabric
ERROR: Ethernet9/five: Configuration does now not in shape the port capability
Question: 26. How Do I Enable/disable Logging Link Status Per Port Basis On A Nexus 7000 Series Switch?
Answer:
All interface link reputation (up/down) messages are logged with the aid of default. Link repute occasions may be configured globally or in keeping with interface. The interface command allows hyperlink popularity logging messages for a specific interface.
For example:
N7k(config)#interface ethernet x/x
N7k(config-if)#logging occasion port hyperlink-fame
Question: 27. On A Nexus 7000 Running Nx-os five.1(3), Can The Decnet Be Bridged On A Vlan?
Answer:
All of the Nexus systems support passing DecNet frames thru the tool from a layer-2 perspective. However, there may be no help for routing DecNet on the Nexus.
Question: 28. Can A Nexus 7000 Be A Dhcp Server And Can It Relay Dhcp Requests To Different Dhcp Servers Per Vlan?
Answer:
The Nexus 7000 does no longer guide a DHCP server, but it does guide DHCP relay. For relay, use the ip dhcp relay cope with x.X.X.X interface command.
Question: 29. How Do I Verify If Xl Mode Is Enabled On A Nexus 7000 Device?
Answer:
The Scalable Feature License is the brand new Nexus 7000 gadget license that enables the incremental desk sizes supported on the M-Series L Modules. Without the license, the machine will run in general mode, which means none of the bigger desk sizes will be handy. Having non-XL and XL modules in a machine is supported, however for the system to run in XL mode all modules need to be XL capable, and the Scalable Feature license wishes to be hooked up. Mixing modules is supported, with the machine jogging within the non-XL mode. If the modules are in the identical machine, the complete machine falls lower back to the common smallest fee. If the XL and non-XL are isolated the use of VDCs, then every VDC is considered a separate device and may be run in one-of-a-kind modes.
In order to verify whether or not the Nexus 7000 has the XL alternative enabled, you first want to check if the Scalable Feature License is mounted. Also, having non-XL and XL modules in a device is supported, however in order for the gadget to run in XL mode, all modules need to be XL capable.
Question: 30. How Do I Implement Vtp In A Nexus 7000 Series Switch Where Vlans Are Manually Configured?
Answer:
Cisco does not endorse going for walks VTP in statistics facilities. If someone attaches a switch to the network with a better revision wide variety with out changing the VTP mode from the server, it’s going to override the VLAN configuration at the transfer.
Question: 31. Is There A Best Practice For Port-channel Load Balancing Between Nexus 1000v Series And Nexus 7000 Series Switches?
Answer:
There is no encouraged exceptional exercise for load-balancing between the Nexus 1000V Series and Nexus 7000 Series Switches. You can pick out either a go with the flow-based totally or a supply-primarily based model depending on the network’s requirement.
Question: 32. During Nexus 7010 Upgrade From five.2.1 To five.2.3 Code, The X-bar Module In Slot four Keeps Powering Off. The %module-2-xbar_diag_fail: Xbar four Reported Failure Due To Module Asic(s) Reported Sync Loss (deverr Is Linknum). Trying To Resync In Device 88 (device Error 0x0) Error Message Is Received.?
Answer:
This error message corresponds to diagnostic failures on module 2. It will be a bad connection to the X-bar from the linecard, which is outcomes in the linecard being not able to sync. Typically with these mistakes, step one is to reseat the module. If that doesn’t remedy the problem, reseat the material in addition to the module personally.
Question: 33. What Does The %oc_usd-slot18-2-rf_crc: Oc2 Received Packets With Crc Error From Mod 6 Through Xbar Slot 5/inst 1 Error Message Mean?
Answer:
These mistakes indicate that the octopus engine received frames that failed the CRC blunders exams. This may be caused by multiple reasons.
For instance:
Hardware troubles:
- Bad hyperlinks
- Backplane problems
- Sync losses
- Seating problems
Software troubles:
- Old fpga
- Frames forwarded to LC that it is not able to apprehend.