MAC (Media Access Control) addresses are 48-bit identifiers assigned to network interfaces for communication on a local network.
Allocation of MAC Addresses:
MAC addresses are not allocated by the IETF. Instead, they are managed and assigned by the IEEE (Institute of Electrical and Electronics Engineers). The IEEE assigns blocks of MAC addresses to hardware manufacturers (vendors), who then assign unique MAC addresses to their devices.
Structure of MAC Addresses:
The first 24 bits (Organizationally Unique Identifier, OUI) identify the manufacturer. The remaining
24 bits are assigned by the manufacturer to ensure global uniqueness.
Why FALSE?
The statement incorrectly attributes the allocation of MAC addresses to the IETF, which is responsible for Internet standards like TCP/IP, not MAC address allocation.
Thus, the correct answer is FALSE.

* DHCP Relay Agent Functionality :
* A DHCP relay agent forwards DHCP packets between clients and servers located in different subnets.
* It modifies the packet headers to ensure proper delivery:
* Converts broadcast packets from clients into unicast packets to forward them to the DHCP server.
* Converts unicast responses from the DHCP server back into broadcast packets for delivery to clients.
* Why C?
* The DHCP relay agent performs bidirectional conversion between broadcast and unicast packets to facilitate communication between clients and servers in different subnets.
* Other Options :
* A : Incorrect because DHCP relay agents do not convert packet types (e.g., Ethernet vs. non- Ethernet).
* B : Incorrect because the relay agent handles both broadcast-to-unicast and unicast-to-broadcast conversions.
* D : Incorrect because the relay agent modifies unicast packets during forwarding.
Thus, the correct answer is C .
References:
* HCIA Huawei ACCESS Official Documentation , Chapter: DHCP Relay Agent.
* RFC 2131: DHCP Protocol Specification .

* 2.4 GHz Frequency Band :
* The 2.4 GHz band is divided into 14 overlapping channels, each 20 MHz wide.
* However, only three channels (e.g., Channels 1, 6, and 11 in North America) are non-overlapping and can be used simultaneously without interference.
* Why TRUE?
* By using non-overlapping channels (e.g., 1, 6, and 11), wireless networks can operate concurrently without significant interference.
Thus, the correct answer is A .
References:
* HCIA Huawei ACCESS Official Documentation , Chapter: WLAN Frequency Bands.
* IEEE 802.11 Standards for WLAN .