What is a characteristic of 20 MHz channel width in a wireless network?

In the 2.4 GHz band the only standardized channel size is 20 MHz, making it the narrowest (and default) channel width available; using 20 MHz minimizes overlap and interference but provides lower throughput than wider channels in other bands.

B. Channel width does not affect how often authentication hand-off occurs.

C. Client reassociation is governed by roaming logic, not channel width.

D. Wider (40/80/160 MHz) channels deliver greater, not lower, throughput.

1. Cisco Enterprise Wireless Design Guide (CVD), 2023, “RF Channel Planning—2.4 GHz,” p.14: “Only 20-MHz channels are supported.”

2. IEEE 802.11-2020, Clause 17.3.8.4, Table 17-6: 20 MHz mandatory in 2.4 GHz.