In this configuration, the wireless interface (wlan1) on the AP is in ap-bridge mode, and on the CPE it's in station-bridge mode. This mode allows full Layer 2 bridging over wireless, supporting all Ethernet-based protocols and services, including:
IPv4, IPv6, DHCP, ARP, PPPoE, and routing protocols like BGP (which use TCP/IP).
Protocols like USB or Firewire are hardware-level or local bus protocols and cannot be transmitted over Ethernet frames or wireless.
Option Review:
A.✔IPv4 – supported
B.✔ARP – Layer 2 protocol, supported
C.✘USB – not a network protocol, not transmitted over bridges
D.✔BGP – Layer 3 protocol, supported over bridged links
E.✘Firewire – not a Layer 2 or network protocol
F.✔IPv6 – fully supported
G.✔DHCP – Layer 3 broadcast protocol, works over bridges
H.✔PPPoE – Ethernet-based protocol, passes over Layer 2 bridge
Extract from Official MTCNA Course Material – Wireless Bridging:
“station-bridge mode allows transparent Layer 2 bridging, supporting all Ethernet protocols including IPv4, IPv6, ARP, DHCP, PPPoE, and more.”
Extract from René Meneses MTCNA Study Guide – Wireless Modes:
“Use station-bridge with ap-bridge to pass full Layer 2 traffic. This allows DHCP, PPPoE, and other protocols to work transparently.”
Extract from MikroTik Wiki – Station Bridge:
“station-bridge mode is used with MikroTik-only links and allows full Layer 2 protocol support, including dynamic IP assignments and bridging.”
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