Layer 3
11 practice questions under this official exam objective (350-401) — each with the community-verified answer, a full option-by-option explanation and instant feedback.
Configure eBGP Neighborship and Network Advertisement
This page resolves a tricky eBGP configuration question requiring the correct local AS, remote AS, neighbor IP, and network statement. It establishes
Which Router Needs IP Directed Broadcast for Wake-on-LAN?
Wake-on-LAN magic packets originate as UDP traffic from an application server and must be delivered as a Layer 2 broadcast to powered-down PCs on a di
Recommended EtherChannel Load-Balancing Mode for Cisco WLCs?
When a Cisco Wireless LAN Controller connects to a switch through an EtherChannel/LAG, the switch must choose a hash mode to spread frames across the
Disabling an EtherChannel with port-channel min-links
The 'port-channel min-links' command sets the minimum number of active member links required for the EtherChannel to stay up. Setting it to 2 means th
What Breaks an LSP Between Two PE Routers?
An MPLS LSP between two PE routers is torn down when the LDP adjacency used to exchange label bindings is lost, or when the label bindings no longer m
Which Tag Sends MPLS L3VPN Packets to the Correct Customer VRF?
In an MPLS Layer 3 VPN, the route target (RT) extended community is the tag that identifies a customer's VPN membership and drives route import into t
Advertising a Default Route from Core to Aggregation to Hide Instability
In a routed Layer 3 campus, the core advertises a default route down to the aggregation layer. The aggregation (and tiers below) then carry only a def
What Is the Function of Penultimate Hop Popping (PHP)?
Penultimate hop popping (PHP) is an MPLS mechanism in which the last P router in the LSP pops the transport label so the egress PE receives only the V
MPLS L3VPN PE Router VPNv4 Translation
This question tests the role of the Provider Edge (PE) router in MPLS Layer 3 VPN architectures, specifically its function in translating customer rou
Which FHRP Prevents Single Router Failure in a Multi-Vendor Network?
A customer needs gateway redundancy across routers from several different vendors while still tuning load sharing between them, which points to VRRP a
Which Protocol Advertises PE Routes to a CE Router in MPLS L3VPN?
In an MPLS Layer 3 VPN, VPNv4 prefixes carried by MP-BGP between PE routers are stripped of their RD before being handed to a VRF-unaware CE, and that