Cisco CCNA (200-301) — All Questions
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On a Cisco switch trunk link using IEEE 802.1Q, how are frames belonging to the native VLAN handled by default?
- a.They are tagged with VLAN ID 1
- b.They are sent untagged✓
- c.They are dropped for security
- d.They are tagged with the highest VLAN ID
With 802.1Q, frames on the native VLAN traverse the trunk untagged by default, while all other VLANs are tagged with a 4-byte VLAN identifier. The native VLAN must match on both ends of the trunk to avoid a mismatch. For security, administrators often change the native VLAN away from the default VLAN 1.
In a Spanning Tree Protocol topology, which switch becomes the root bridge?
- a.The switch with the highest MAC address
- b.The switch with the most ports
- c.The switch with the lowest bridge ID✓
- d.The switch configured last
STP elects the root bridge as the switch with the lowest bridge ID, which is the combination of bridge priority and MAC address. If priorities are equal (default 32768), the lowest MAC address breaks the tie. Administrators lower the priority on the desired switch to control root placement.
Which EtherChannel negotiation protocol is an IEEE open standard (802.3ad) rather than Cisco-proprietary?
- a.LACP✓
- b.PAgP
- c.CDP
- d.VTP
LACP (Link Aggregation Control Protocol) is the IEEE 802.3ad open standard for dynamically bundling multiple physical links into one logical channel. PAgP is Cisco's proprietary equivalent. Bundling links increases bandwidth and provides redundancy while STP treats the channel as a single logical interface.
In a wireless network, what is the primary role of a Wireless LAN Controller (WLC) in a split-MAC architecture?
- a.It replaces all access points
- b.It acts only as a DHCP server
- c.It broadcasts the SSID directly to clients
- d.It centrally manages configuration and RF for lightweight APs✓
In split-MAC (controller-based) deployments, lightweight access points handle real-time RF functions while the WLC centrally manages configuration, security policies, roaming, and RF resource management via CAPWAP tunnels. This centralizes control of many APs. Autonomous APs, by contrast, operate independently without a controller.