EVPN-VXLAN Signaling

JNCIP-DC · 50 questions

• City engineers see EVPN Type-2 routes for a server MAC and IP on the municipal leaf fabric. What is the primary purpose of those Type-2 advertisements?
• A leaf needs to discover other VTEPs participating in a city VNI so BUM traffic has destinations. Which EVPN route type primarily supports that inclusive multicast / IMET membership role?
• County IT uses EVPN Type-5 between VRFs to share subnet prefixes across the data-center fabric. What do Type-5 routes primarily carry?
• After enabling multihoming on a municipal server ESI, ops confuses EVPN Type-1 with Type-2. What role do Type-1 Ethernet Auto-Discovery routes primarily play?
• A city design needs to advertise an Ethernet Segment Identifier so multihomed leaves can discover the shared ES and participate in DF election. Which EVPN route type serves that high-level purpose?
• The municipal NOC asks which EVPN advertisements carry MAC mobility sequence attributes when a server MAC moves between leaves. Which answer is correct?
• A township imports EVPN Type-5 prefixes and expects Layer 2 VNI stretching for the same broadcast domain. What correction should the engineer make?
• In the city lab, engineers observe EVPN Type-2 routes both with and without an IP address. What conceptual distinction do those variants represent?
• A route-target mismatch causes a municipal leaf to drop all EVPN Type-2 routes for a tenant. What does that symptom reinforce about EVPN route types?
• During a metro DCI discussion, architects mention EVPN Type-5 for Layer 3 interconnect between city data centers. What pattern does that preview within EVPN signaling concepts?
• An engineer reads a blog about an obscure EVPN route type rarely seen in the city's Juniper EVPN-VXLAN fabric. For JNCIP-DC-level focus, which guidance is sound?
• Public works asks why EVPN defines multiple route types instead of one catch-all NLRI for the municipal fabric. What is the best explanation?
• The city wants efficient multicast for IPTV receivers inside a tenant VNI on the EVPN-VXLAN fabric. Which statement best reflects EVPN multicast concepts at professional depth?
• Ops still floods all BUM traffic to every VTEP in a municipal VNI even when few leaves have interested receivers. Which improvement direction matches selective multicast concepts in EVPN?
• A township enables IGMP snooping on EVPN-VXLAN tenant bridges. How should that state relate to EVPN multicast signaling?
• The NOC asks whether classic underlay PIM is mandatory whenever EVPN multicast features are used in the city fabric. What is the accurate contrast?
• Duplicate multicast frames appear on a multihomed municipal Ethernet Segment after a change. Which EVPN multicast interaction should engineers review first?
• Municipal security wants multicast for one tenant contained so it does not leak into other tenants' broadcast domains. What EVPN-VXLAN principle applies?
• After operators disable IMET (Type-3) advertisements on a city leaf, BUM delivery for a VNI breaks. What does that confirm?
• Architects compare ingress replication versus underlay multicast trees for BUM on the municipal EVPN fabric. Which tradeoff statement is most accurate?
• The city underlay already runs BGP for IP fabric routes, and the overlay needs EVPN. What must engineers apply regarding Multiprotocol BGP?
• A leaf shows established IPv4 unicast BGP to the spines but installs no EVPN routes for municipal tenants. What should operators check first in MBGP terms?
• Route reflectors for EVPN sit on the city spines so leaves need not mesh full EVPN iBGP. What design idea does that apply?
• A township runs EBGP in the underlay for IP fabric reachability and iBGP EVPN for the overlay on separate session/family concerns. What awareness does that design reflect?
• The NOC tries to filter municipal EVPN routes using only ordinary IPv4 prefix-lists and finds the policy ineffective. What concept should they apply?
• A city fabric enables BGP add-path so equal-cost EVPN Type-2 paths from multiple VTEPs stay visible in the RIB. What overlay outcome does that primarily support?
• A municipal EVPN design uses a route-target community so only matching VRFs import a tenant's Type-2 and Type-5 routes. What does that extended community primarily control?
• City leaf peers establish BGP EVPN, but large UPDATE messages carrying many Type-2 routes are silently dropped on the path. Which transport health issue is the most likely cause?
• A municipal design places every tenant IRB default gateway on the spines while leaves only bridge into L2 VNIs. Which EVPN architecture is that?
• The city prefers anycast IRB default gateways on every leaf so spines mainly forward underlay transit. Which EVPN architecture matches that preference?
• Ops asks which EVPN architecture most often avoids hairpinning east-west inter-subnet traffic up to the spine. What should the engineer answer?
• A small township wants its first EVPN-VXLAN fabric with fewer devices holding complex tenant routing features. Why might CRB be chosen operationally?
• Spine TCAM utilization climbs as CRB host routes and IRB state concentrate centrally. What scale tradeoff does that illustrate versus ERB?
• A design diagram shows tenant VXLAN tunnels for inter-subnet routing terminating only on the spines, while leaves bridge into L2 VNIs. Which architecture does that depict?
• A fabric diagram shows VXLAN VTEPs and IRB interfaces on every leaf for tenant default gateways. Which EVPN architecture does that map to?
• During a city design review, engineers debate informal hybrid marketing labels for gateway placement. What should the JNCIP-DC candidate treat as the official architecture families on the blueprint?
• A server VM moves from one city leaf to another and the fabric must update where its MAC is known. Which EVPN behavior handles that move?
• The city enables ARP suppression that answers local ARP requests using information learned from EVPN MAC/IP routes. What is the main benefit?
• Ops sees the same MAC advertised from conflicting Ethernet Segment locations and suspects a learning conflict. What awareness should the engineer apply?
• On a leaf, a MAC is learned from a local access port while another MAC for a remote host arrives via EVPN. How do those learning paths differ?
• After an engineer clears the EVPN database on a leaf, MAC entries begin returning. From where do they repopulate?
• NOC staff expect classic STP MAC-flush behavior after a topology change, but the city fabric is EVPN-VXLAN. What contrast should they apply?
• Inter-subnet traffic uses the same L3 VNI mapping model in both directions between VTEPs. Which routing model is that?
• An asymmetric model routes at the ingress leaf toward a remote MAC using the L2 VNI, while the egress primarily bridges. How does that differ from symmetric IRB?
• The city standardizes on symmetric IRB across the fabric for operational predictability. What is the strongest rationale?
• Troubleshooting shows return traffic using a different encapsulation mode than the forward path between two leaves. What should the engineer suspect?
• An engineer must confirm that an EVPN Type-2 MAC/IP route for a host is advertised from a leaf. Which monitoring action best fits?
• BGP EVPN sessions are Established, yet a leaf installs no remote tenant routes. Investigation shows the route-target import is missing on the routing instance. What is the right fix focus?
• In a CRB design, inter-subnet traffic for a VLAN fails and the spine has no IRB for that VLAN. What configuration check aligns with the architecture?
• A multihomed Ethernet Segment shows an unexpected Designated Forwarder on city leaf peers. What should troubleshooting examine first at professional depth?