Fiber Channel over Ethernet (FCoE) Interview Questions & Answers

Fiber Channel over Ethernet (FCoE) Interview Questions

Fiber Channel over Ethernet is a computer set-up skill that summarizes Fibre Channel frames over Ethernet networks. If you are well aware of the Fiber Channels over Ethernet and want to shift the carrier in this then we in Wisdomjobs have provided you all types of Fiber Channel over Ethernet Interview Question and Answers on our site page. There are many leading companies that offer job roles like Solution Engineer, Level 1 Network/Systems Engineer, System Engineer - Backup & Storage, Associate Engineer (Application Support), Media Technology Engineer, Enterprise System Engineer and many other roles too. For more details on Fiber Channel over Ethernet jobs feel free to visit our Wisdomjobs FCOE site page.

Fiber Channel Over Ethernet (FCoE) Interview Questions And Answers

Fiber Channel over Ethernet (FCoE) Interview Questions
    1. Question 1. Does Nx-0s 5.0 Run Npiv?

      Answer :

      Yes, it is supported in NX-OS 5.0. Nexus 5000 platform supports N port  identifier virtualization (NPIV) and N-Port Virtualization(NPV) since NX-OS 4.0  version. Nexus 5K supports two modes. By default, Cisco Nexus 5000 and 5500  Series switches operate in fabric mode, in this mode switch provides standard FC  switching capability and features. Second mode is NPV, in NPV mode Nexus 5K  switches relays all the traffic from server-side ports oto the core switch.(NPIV  enabled switch). The core switch provides F port functionality and all FC  switching capabilities.

    2. Question 2. Is Fcoe Between Data Centers Possible?

      Answer :

      Yes, FCoE between Data Centers is possible. VE Ports allow you to build  multi-hop FCoE fabrics by interconnecting multiple FCF, VE port functions as a  Fibre Channel E-port running on top of a lossless Ethernet fabric. The maximum  distance between two Cisco Nexus 5000 Series switches is 3000m for FCoE  (lossless Ethernet) traffic with NX-OS 5.0(2)N1.1. It can be enabled using the  pause no-drop buffer-size buffer-size pause-thresholdxoff-size resume-threshold xon-size command in QOS configuration.

      Here are the maximum  distances:

      • Nexus 55xx to Nexus 55xx - 3km
      • Nexus 50x0 to Nexus 50x0 - 3km
      • Nexus 50x0 to Nexus 55xx - 3km
      • Nexus 55xx to Nexus 2232 - 300m
      • Nexus 50x0 to Nexus 2232 - 300m

    3. Question 3. Can You Explain The Vlan Trunking Channels A Little Bit More?

      Answer :

      We support Virtual LAN on top of the Fibre channel Over ethernet work. So  trunking means we carry different Virtual LAN altogether in one ISL. And the  same on FCOE we also support Virtual SANs and can carry multiple virtual SANs on  one isl. In turns of multi-hop FCOE we will see that we could carry multiple  virtual LAN and virtual SANs together.

    4. Question 4. Can Fcoe Be Used With Ucs?

      Answer :

      Yes. In latest UCS 1.4 release, you can directly connect FCoE targets to the  Fabric Interconnect ports. Also on UCS system we have FIP cabable (Gen2) CNAs  and Pre-FIP (Gen1) CNAs running on the blades that utilizes FCoE between blades  and Fabric Interconnect. If you would like to extend Fabric Interconnect  connectivity with VE ports and connecting them to Nexus 5K switches in terms of  running multi-hop FCoE, we don't support this on the UCS software yet.

    5. Question 5. What Is The Next Data Rate After 10 Gig For Fc? Is It 16 Gig? When Will It Be Supported?

      Answer :

      After the 10 Gig model the discussion are in 12 Gig and 16Gig. If you are  asking Cisco will be supporting 16 gig FC, yes we will be supporting it and we  will have products that will be supporting 16 gig FC.

    6. Question 6. Is There A Limit On The Number Of Hops That Can Be Made In A Multihop Environment/design?

      Answer :

      The limit is 7 actually. You can have upto 7 FCoE hops that are tested and  supported by Cisco. If there is any requirement to support more than 7 hops,  that can be tested by Cisco.

    7. Question 7. Can We Configure Multiple Cos Values For Pfc ?

      Answer :

      Yes, if you are asking you can use different COS values for PFC. PFC uses the  IEEE 802.1p CoS values in the IEEE  802.1Q VLAN tag to differentiate up to eight  CoSs that can be subject to  flow control independently. So on Nexus 5K,by  default we have 8 lanes , 8 qos-groups. Qos 6 and Qos 7 are reserved for control  plane trafic and the rest 6 qos-groups can be assigned to drop-class or  no-drop-class. By default FCoE is assigned COS 3.

    8. Question 8. What If We Want To Trunk Multiple Data Vlans To A Service Thats Running Esxi For Example Do We Still Need To Configure Trunking On Switch Ports?

      Answer :

      Yes if you want to carry multiple data VLANs on ESXi , we definitely need to  configure trunking. Also another reason if you want to use FCoE, Fiber  Channel over Ethernet Initialization Protocol (FIP) uses the native VLAN and  therefore all FCoE links should be trunked to carry the FCoE VLAN as well as the  native VLAN.

    9. Question 9. What Is The Difference Between Cee And A Dce?

      Answer :

      CEE is the Converged Enhanced Ethernet. The CEE authors group was an informal  group of companies that submitted the initial proposals of PFC , ETS and DCBX to  the IEEE DCB working group.DCE is a Cisco term that describes the architectural  collection of ethernet extensions based on open standards. DCE includes support  for the ethernet extensions found in EEE DCB.

    10. Question 10. How Is The Fcoe License Activated On The Nexus 5000 Or 5500 Series?

      Answer :

      There is an option in the Nexus 5000 called storage service license which is  activated when it is shipped from Cisco. When ordered as a seperate line card  item an activation key and the procedure for activating the code is delivered in  an envelope. Because this is always present and only activation is needed and  any Nexus 5k will automatically initiate the 120 days temporary license for a  storage protocol service from the first use of FC or FCoE command.

    11. Question 11. Is Fcoe Ip Routable?

      Answer :

      No, there is no Ip layer in FCoE. FC-BB-5 contains FCIP that is  "IP-routable". FCoE is FC-routable. FCoE switches may forward FC frames across  different Ethernet Clouds, FCoE switches may forward FC frames over the Internet  using FCIP.

    12. Question 12. Do I Need To Enable Jumbo Frames For Fcoe?

      Answer :

      Yes. You need to enable jumbo frames because the FC payload is 2,112  bytes  and enabling jumbo frames will keep FCoE traffic from being fragmented. On Nexus  5K, we have a pre-defined Class of Service (CoS) to be FCoE, which is by default  has the value 3. Within this CoS, the MTU size it set to 2158.

    13. Question 13. What Are The Hardware Requirements For Deploying Fcoe? What Are Your Recommendations And Suggestions For Optimizing Fcoe Deployments?

      Answer :

      In general, FCoE requires a switch that enables data center bridging (DCB) to extend traditional Ethernet networks to fit the delivery of storage traffic without losing data. Some (but not all) of the Ethernet vendors support DCB functionality for 10 GbE switches. Meanwhile, the converged network adapter (CNA) is suitable for FCoE. The CNAs are for use with traditional Ethernet and Fiber Channel host bus adapters (HBAs) and support Ethernet and Fibre Channel on the same cable at the same time. These CNAs are 10 Gbps over both Ethernet and Fiber Channel.

    14. Question 14. What Software Is Needed To Deploy Fcoe And How Well Are These Software Stacks Adapted To Fcoe?

      Answer :

      We have been running FCoE since 2008, first on Windows. FCoE supports the latest version of Linux, Solaris and other operating systems. Each CAN adapter has a driver that works in the right environment. And many CNA vendors use the same suite of drivers for both native Fiber Channel and FCoE. FCoE also supports VMware. Now, some people are trying to make FCoE iSCSI in the operating system, but this depends on how many people buy it account.

    15. Question 15. Does Fcoe Have Storage Subsystems That Meet Specific Needs? What Are The Features Of Fiber Channel Subsystems?

      Answer :

      FCoE can support the storage subsystem locally, and some vendors have stated it publicly. NetApp has also implemented native FCoE support as well as other vendors. The FCoE fabric must be interoperable with the native Fiber Channel fabric and the FCoE must support all Fiber Channel features. We tested the servers that let FCoE CAN connect to DCB / FCoE switches (their local Fiber Channel ports are also connected to local Fiber Channel storage systems) to see if they were working as expected. At the storage system interface level, FCoE is equivalent to Fiber Channel running at 10 Gbps. The only difference is that it connects the DCB / FCoE switch instead of the local Fiber Channel switch.

    16. Question 16. What’s The Right Management Tool For Fcoe Storage? What Is The Level Of Support For Third-party Data Center Management Tools By Fcoe? Also, Are Management Tools And Storage Subsystems Together Better?

      Answer :

      The DCB / FCoE switches have their own partitioning interface, but it is up to the vendor, which is similar to their corresponding Fiber Channel interface. HBA / CAN Providers Storage providers that support FCoE use the same management interface that was previously used on adapters, and make the management interface almost identical to Fiber Channel. Although we did not test much third-party storage management software, FCoE and Fibre Channel should be similar to this management software. The main difference is that FCoE storage will connect with different switches instead of local Fiber Channel storage.

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