2.2 Data, Control, and Management Plane Technologies 400-007 Practice Questions (Page 2)

Questions 6–10

1. 6expert · hard

   A large enterprise is designing a new data center fabric using VXLAN with BGP EVPN as the control plane. The design must support multi-tenancy with overlapping IP addresses between tenants. The network team is concerned about the scalability of the BGP EVPN control plane, specifically the number of routes that must be processed by the spine switches. They are evaluating whether to use symmetric IRB (Integrated Routing and Bridging) or asymmetric IRB for inter-subnet routing. The design must also minimize the number of VTEPs that need to learn a given tenant's MAC and IP routes. Which design choice best addresses the control-plane scalability concern while supporting overlapping IP addresses?

   • AUse asymmetric IRB with a centralized anycast gateway on the spines, because this centralizes the routing decision and reduces the number of VTEPs that need to learn tenant routes.
   • BUse asymmetric IRB, because it requires only the ingress and egress VTEPs to learn the tenant's MAC and IP routes, reducing the overall route table size on the spines.
   • CUse symmetric IRB, because it uses a unique anycast gateway MAC and IP per tenant, and only the VTEPs that are actively forwarding traffic for a tenant need to hold that tenant's routes in their forwarding tables.
   • DUse symmetric IRB with a dedicated L3 VNI per tenant, but disable ARP suppression on the VTEPs to ensure the control plane has full visibility of all endpoints.
   Reveal Solution Discussion Select an answer first
2. 7foundation · easy

   In a network design, which protocol is used to establish and maintain label-switched paths (LSPs) in an MPLS network?

   • ASTP (Spanning Tree Protocol)
   • BSNMP (Simple Network Management Protocol)
   • CHTTP (Hypertext Transfer Protocol)
   • DLDP (Label Distribution Protocol)
   Reveal Solution Discussion Select an answer first
4. 8application · medium

   A large enterprise is deploying a new network management system (NMS) to monitor and configure its routers and switches. The design must support automated configuration backups, real-time performance monitoring, and the ability to push configuration changes to multiple devices simultaneously. The network team is considering using a combination of protocols. Which protocol combination is best suited for these requirements?

   • AUse CLI scripting with Expect to automate configuration backups and changes, and use NetFlow for performance monitoring.
   • BUse SNMPv3 for performance monitoring and configuration backup, and use SSH for pushing configuration changes.
   • CUse NETCONF/YANG for configuration management and pushing changes, and use SNMPv3 for performance monitoring.
   • DUse SNMPv3 for all functions, including configuration management, and use syslog for monitoring.
   Reveal Solution Discussion Select an answer first
5. 9foundation · easy

   Which technology is primarily responsible for exchanging reachability information between routers to build the network topology view used for forwarding decisions?

   • ARouting protocols such as OSPF and BGP
   • BQuality of Service (QoS) mechanisms such as queuing and shaping
   • CForwarding engines such as ASICs and TCAM
   • DManagement protocols such as SNMP and NETCONF
   Reveal Solution Discussion Select an answer first
6. 10foundation · easy

   Which data plane technology is used to forward packets based on the destination IP address by performing a longest-prefix match lookup in the forwarding table?

   • ANetwork Address Translation (NAT)
   • BMAC address switching (Layer 2 forwarding)
   • CMPLS label switching
   • DIP routing (Layer 3 forwarding)
   Reveal Solution Discussion Select an answer first