cisco vpc interview questions

Prepare well for the interview for different concepts such as Cisco Nexus product family (Nexus 9000, Nexus 7000, Nexus 5000, Nexus 3000, Nexus 2000, Nexus 1000V and MDS 9000) if you’re looking for a job with Cisco Nexus switches and need a good job interview preparation material with answers. We have clarified the distinctions between Nexus and Catalyst switches and also compared the available commands, naming schemes, hardware, etc. between Nexus NX-OS and Catalyst IOS operating systems. You can look for and apply for jobs related to Cisco Nexus Switches, such as networking consulting engineers, routing jobs, Cisco nexus jobs, network architects, network managers, and senior associates, among others. are available on wisdom jobs. To prepare for interviews, review our list of Cisco Nexus Switch interview questions and answers. Looking at this page will help you improve your chances.

Cisco Nexus Interview Questions and Answers
  • Question 1 – What is vPC, and what are its benefits? …
  • Question 2 – What are the components of vPC? …
  • Question 3 – What do you mean by “vPC Peer-Switch”? …
  • Question 4 – What do you mean by “vPC Peer-Link”? …
  • Question 5 – What do you mean by “vPC Keep-Alive”?

Cisco Nexus VPC Interview Questions answer

Question  – 1 Why VPC ? How VPC is working ?

  • VPC is Cisco proprietary. Actually a traditional network uses spanning-tree protocol to prevent layer-2 loops. It does have some limitations. As per spanning tree process – to prevent loops, it blocks some links and uses other link as active.
  • If active link will be fail, then blocked port will be ready to use. In case of link failure STP uses the SPF (Shortest Path First) algorithm to calculate which link will be unblock, after that link goes through several states (Listening, Learning and forwarding) before it will be active.
  • So blocked ports are unused, means wasting of bandwidth. Modern Spanning Tree (PVST) has some improvement regarding this. One link may be blocked for VLAN 10, and the same link may be active for VLAN 20. This is a type of load balancing in spanning tree. But what will happen if there is a lot of traffic on VLAN-10 and VLAN-20, in this situation traffic is not load balanced normally.
  • Spanning-tree also impact in sub-optimal paths. If traffic needs to travel from Switch A to Switch B, it will be pass through the Switch A.
  • We can improve these things via Ether-Channels. It will allows many active up-links between two switches or devices. But it still has some limitations, Ether-Channel will be only between two devices. If any single switch will fail , it will cause an outage for the bundle of links.
  • VPC is an extension to Ether-Channels. There are single method, which cross the limitations of spanning-tree and Ether-Channel. Actually VPC allows the links which are physically connected to two different Nexus devices to appear as a single Port-Channel to a third device which can be a switch, server, or any other networking device.
  • All links in the VPC will be forward traffic actively. VPC is Multi-Chassis Ethernet Technology (MCEC), but are not a stack. VSS (Virtual Switching System) on the Catalyst platform is another multi-chassis technology.
  • VPC also provide high-availability. Both set of links will be active, so it also have a fast convergence time. If a link or a group of links will fail, the other links already forwarding traffic. This is much faster than spanning-tree.
  • Question – 2 What is purpose of VPC ?

  • Actually VPC allows the links which are physically connected to two different Nexus devices to appear as a single Port-Channel to a third device which can be a switch, server, or any other networking device.
  • It can provide Layer 2 multi-pathing, basically Layer 2 multi-pathing allows to create redundancy by increasing bandwidth, enabling multiple parallel paths between nodes and load-balancing traffic where alternative paths exist.
  • 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.

    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.

    Additionally, a trusted traveler kiosk, accessible only to NEXUS and CANPASS Air members, is available at Billy Bishop Toronto City Airport for incoming flights.

    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.

    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.

    Once entering Canada, NEXUS in the marine mode is available at about 450 locations.

    On Cisco Nexus 7000 Series systems running Cisco NX-OS Unleash 5, FCoE is supported. 2 or later.

    FCoE is supported by the Cisco Nexus 7000 Series 32-Port 1 and 10 Gigabit Local Area Network Module. The half range of the merchandise is N7K-F132XP-15.

    A port-channeling idea that extends link aggregation to two different physical switches is called Virtual PortChannel (vPC).

    When there are no failing vPC ports or links, the Nexus 7000 incorporates a loop hindrance methodology that drops traffic traversing the peer link (destined for a vPC peer link). The rule is straightforward: even if a vPC lacks the first VLAN, a packet crossing the vPC peer link should not exit any port there.

    FAQ

    What is vPC in Cisco?

    vPC’s, or Virtual Port Channels, are a Cisco Nexus technology. They are utilized to simultaneously connect layer-2 devices to two switches. This enables the data center to have a highly available environment. If one switch fails, the other one continues to operate.

    How many switches are there in a vPC?

    Two switches are the most that can be present in a vPC domain. There can only be one vPC peer per switch or VDC. FHRP virtual IP is supported when static routing is used from a device to vPC peer switches with a next hop. It is not supported to have a dynamic routing adjacency between vPC peer switches and any Layer3 device connected to a vPC.

    What is Cisco vPC and what are its benefits?

    Benefits of Cisco VPC Enables use of a port-channel by a single device across two upstream devices. Spanning Tree Protocol (STP)-blocked ports are removed by vPC Provides a loop-free topology. Uses all available uplink bandwidth. provides quick convergence in the event of a device or link failure.

    What is vPC and VDC?

    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).

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