Cisco ENCOR 350-401 Flashcards

Which OSPF network type does NOT elect a DR/BDR by default?

Answer: Point-to-point

Point-to-point OSPF network types do not elect a DR or BDR because there are only two routers on the link.

A network engineer needs to prevent a specific BGP prefix from being advertised to an eBGP peer. Which mechanism is most appropriate?

Answer: Outbound route filter with a prefix-list

An outbound route filter using a prefix-list applied to the neighbor statement blocks specific prefixes from being sent to an eBGP peer.

Which QoS mechanism discards lower-priority packets during congestion to avoid tail-drop?

Answer: WRED

Weighted Random Early Detection (WRED) proactively drops lower-priority packets before queues fill completely, avoiding global synchronization from tail-drop.

In EIGRP, what is the Feasible Distance (FD)?

Answer: The total metric from the local router to the destination

The Feasible Distance is the metric calculated by the local router for the best path to a destination, combining the reported distance and local link cost.

Which 802.1Q feature allows a trunk port to carry untagged traffic for a specific VLAN?

Answer: Native VLAN

The native VLAN on an 802.1Q trunk carries frames without a VLAN tag; both ends of the trunk must agree on the same native VLAN.

What does the 'ip helper-address' command accomplish on a Cisco router?

Answer: Forwards UDP broadcast packets to a specified unicast address

The ip helper-address command converts UDP broadcasts (including DHCP discover packets) into unicast packets forwarded to the specified server address.

Which spanning tree port state forwards traffic AND learns MAC addresses?

Answer: Forwarding

Only the Forwarding state allows a port to both pass data traffic and populate the MAC address table.