Best Cisco Nexus Switches Interview Questions

What Is Nexus?

NEXUS is a bi-national, Canada-United States program for pre-approved, low-risk travellers entering Canada or the United States (U.S.) at designated air, land and marine ports of entry.

The program enables its members to enter either country more quickly and easily by using automated self-serve kiosks in the air mode of travel, dedicated lanes in the land mode of travel, and by calling Telephone Reporting Centres (TRCs) prior to arrival in the marine mode of travel.

What Are The Benefits Of Using Nexus?

NEXUS members avoid long line-ups and save time using automated self-serve kiosks at nine Canadian international airports (NEXUS Air).

As an added benefit, when travelling on domestic, U.S.-bound, and select international flights, NEXUS members can be expedited through Canadian Air Transport Security Authority (CATSA) airport security screening lanes located at 16 Canadian airports. Members must present their valid NEXUS card to access the Trusted Traveller CATSA Security Line.

Members also enjoy a quick and simplified entry process using dedicated lanes at 21 designated land border crossings.

When arriving by boat, members travelling to over 450 marine sites in Canada can report by phone to a TRC between 30 minutes and four hours before they arrive.

NEXUS allows Canadian and U.S. border officers to focus their efforts on unknown and potentially higher-risk travelers and their goods.

What Is The Size Of A Nexus Card?

A NEXUS card is approximately the same size as a standard credit card or driver’s licence.

How Does Nexus In The Air Mode Work?

NEXUS members can use the automated kiosks located in the U.S. Preclearance area and the Canadian inspection services area at participating airports.

Members can proceed directly to the NEXUS self-serve kiosk and do not need to go through the standard queue to speak to a border services officer or CBP officer.

Members stand in front of the self-serve kiosk and look into the adjustable camera and follow the audio instructions so that their irises can be photographed using iris recognition biometric technology.

Once the CBSA or CBP has confirmed that the photo of the irises matches the one on file, the member will use the touch screen to answer standard customs and immigration questions.

NEXUS members residing in Canada can use a Traveller Declaration Card (TDC) to declare goods and pay for any duties or taxes when entering Canada. Members simply deposit a TDC in a secure TDC box conveniently located near a self-serve kiosk. Any duties or taxes owing will be collected through the credit card information provided on the TDC.

Where Is Nexus In The Air Mode Available?

NEXUS in the air mode is available at 8 locations when entering Canada.

In addition, please note that a trusted traveller kiosk is also available at Billy Bishop Toronto City Airport, for incoming flights only for use by members of NEXUS and CANPASS Air.

Where Is Nexus In The Marine Mode Available?

NEXUS in the marine mode is available at approximately 450 locations when entering Canada.

Why Does Vpc Not Block Either Of The Vpc Uplinks?

Nexus 7000 has a loop prevention method that drops traffic traversing the peer link (destined for a vPC peer link) when there are no failed vPC ports or links. The rule is simple: if the packet crosses the vPC peer link, it may not go out any port in a vPC even if that vPC does not have the original VLAN.

Is There A Tool Available For Configuration Conversion On Cisco 6500 Series To The Nexus Platform?

Cisco has developed the IOS-NXOS Migration Tool for quick configuration conversion on Cisco 6500 series to the Nexus series OS.

What Are Orphan Ports?

Orphan ports are single attached devices that are not connected via a vPC, but still carry vPC VLANs. In the instance of a peer-link shut or restoration, an orphan port’s connectivity may be bound to the vPC failure or restoration process. Issue the show vpc orphan-ports command in order to identify the impacted VLANs.

What Is The Minimum Nx-os Release Required To Support Fcoe In The Nexus 7000 Series Switches?

FCoE is supported on Cisco Nexus 7000 Series systems running Cisco NX-OS Release 5.2 or later.

On A Nexus, Is The Metric-type Keyword Not Available In The “default-information Originate” Command?

On a Nexus, use a route-map command with a set clause of metric-type type-[½] in order to have the same functionality as in IOS using the default-information originate always metric-type [½] command.

For example:

switch(config)#route-map STAT-OSPF, permit, sequence 10switch(config-route-map) #match interface ethernet 1/2switch(config-route-map) #set metric-type {external | internal | type-1 | type-2}

What Is Vpc And What Are Its Benefits?

Virtual PortChannel (vPC) is a port-channeling concept that extends link aggregation to two separate physical switches.

Benefits of vPC include:

Utilizes all available uplink bandwidth
Allows the creation of resilient Layer 2 topologies based on link aggregation
Eliminates the dependence of Spanning Tree Protocol in Layer 2 access distribution layer(s)
Enables transparent server mobility and server high availability (HA) clusters
Scales available Layer 2 bandwidth
Simplifies network design
Dual-homed servers can operate in active-active mode
Faster convergence upon link failure
Improves convergence time when a single device fails
Reduces capex and opex

How Do I Create A Peer Link For Vdc And A Keepalive Link For Each Vdc?

Configure the vPC Keepalive Link and Messages

This example demonstrates how to configure the destination, source IP address, and VRF for the vPC-peer-keepalive link:

switch# configure terminal
switch(config)# feature vpc
switch(config)# vpc domain 100
switch(config-vpc-domain)# peer-keepalive destination 172.168.1.2 source
172.168.1.1 vrf vpc-keepalive
Create the vPC Peer Link
This example demonstrates how to configure a vPC peer link:
switch# configure terminal
switch(config)# interface port-channel 20
switch(config-if)# vpc peer-link
switch(config-vpc-domain)#

What Does The %eem_action-6-inform: Packets Dropped Due To Ids Check Length Consistent On Module Message Mean?

Cisco NX-OS supports Intrusion Detection System (IDS) checks that validate IP packets to ensure proper formatting. This is an enhancement beginning in 5.x.

The EEM message is being logged because a packet is received by the switch where the Ethernet frame size is shorter than the expected length to include the IP packet length plus the Ethernet header. The packet is dropped by the hardware due to this condition.

In order to verify that the IDS drops occurred since the last switch reboot, issue the show hardware forwarding ip verify module [#] “.

How Many Syslog Servers Can Be Added To A Nexus 7000 Series Switch?

The maximum number of syslog servers configured is 3.

Is Nexus 7010vpc Feature (lacp Enabled) Compatible With The Cisco Asa Etherchannel Feature And With Ace 4710 Etherchannel?
With respect to vPC, any device that runs the LACP (which is a standard), is compatible with the Nexus 7000, including ASA/ACE.