Free Cisco 300-165 Exam Practice Questions & Explanations
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Before a maintenance window, an operator must upgrade a pair of Nexus 9000 switches in a vPC domain with minimal traffic loss, and the release notes confirm the current and target releases are ISSU compatible. Which approach and verification best supports this requirement?
The supported practice is to verify the upgrade impact and non-disruptive eligibility with show install all impact, then upgrade one vPC peer at a time with install all, allowing the surviving peer to forward traffic. Reloading both peers at once causes a full outage. Simply saving the config and reloading modules is not an image upgrade procedure and is disruptive. Disabling the peer-link would trigger vPC failure behavior and orphan-port outages.
An engineer configures OSPF between a Nexus 9000 aggregation switch and a core router. The interfaces are up and both are in area 0, but the neighbor stays in EXSTART/EXCHANGE. Interface MTUs are 9216 on the Nexus and 1500 on the router. Which two actions resolve the adjacency? (Choose two.)
Neighbors stuck in EXSTART/EXCHANGE is the classic symptom of an MTU mismatch, since DBD packets carry the interface MTU and are rejected when they differ. Fixing the MTU on both sides, or suppressing the check with ip ospf mtu-ignore, restores the adjacency. Network type or timer changes address 2-WAY/INIT or flapping problems, not EXSTART. Identical router IDs would break the adjacency entirely.
Two data centers are connected with OTV over a dark fiber DCI. The OTV overlay comes up and MAC addresses are learned, but the network team notices that VLAN 100 exists at both sites and is being extended, even though it should stay local. Which action correctly limits which VLANs are extended across the overlay?
The otv extend-vlan command under the overlay interface explicitly defines the VLANs carried over the overlay; removing VLAN 100 stops its extension. The join interface is a routed Layer 3 interface, so trunk allowed lists do not apply. The site VLAN must be a VLAN that is not extended and is used for AED election between local edge devices; using VLAN 100 for that purpose is unrelated to stopping extension of other VLANs and is bad practice if it is a production VLAN. ARP inspection does not prevent MAC advertisement over OTV.
A data center uses VXLAN EVPN with distributed anycast gateway on Nexus 9000 leaf switches. Hosts in VLAN 10 on leaf-1 can reach hosts in VLAN 10 on leaf-2, but a host that moves from leaf-1 to leaf-2 briefly loses its default gateway ARP entry. Which design element ensures the moved host does not need to re-ARP for a new gateway MAC?
The distributed anycast gateway relies on all leaf switches sharing the identical anycast gateway MAC (configured globally with fabric forwarding anycast-gateway-mac) plus the same SVI IP in the VNI. The host keeps its existing ARP entry after the move. Unique SVI IPs defeat the anycast gateway. ARP inspection is a security feature, and BUM replication method has no bearing on gateway MAC consistency.
An engineer is building a vPC domain between two Nexus 9000 switches. The peer-keepalive link is up over mgmt0, but after configuring the peer-link the vPC peers remain in a suspended state and the log shows a Type 1 consistency check failure. Which configuration mismatch would cause a global Type 1 inconsistency that suspends all vPC VLANs?
Spanning-tree mode is a global Type 1 parameter. A mismatch in STP mode between vPC peers suspends all vPC VLANs on the secondary peer. Role priority is intentionally different between peers and only elects the primary/secondary role. SVI descriptions are cosmetic, and HSRP timers on non-vPC SVIs are not part of vPC consistency checking (a per-VLAN MST/STP cost mismatch would be Type 2, only affecting that VLAN).