Huawei Updated H12-811_V1.0 Exam Questions and Answers by saif

The IPv4 header length is variable and is determined by the Header Length (IHL) field in the IPv4 header.

Minimum header size: 20 bytes (5 x 4B) → No options field.

Maximum header size: 60 bytes (15 x 4B) → Includes maximum options.

Option A (Incorrect - 64B): The maximum possible length of an IPv4 header is 60B, so 64B is not possible.

Option B (Correct - 20B): This is the standard IPv4 header size without options.

Option C (Correct - 60B): This is the maximum IPv4 header size with options.

Option D (Correct - 32B): This is a possible IPv4 header size with some options.

Thus, the correct answer is A (64B).

Detailed Explanation:When bridge priorities are identical, STP elects the switch with the lowest MAC address as the root. Here, Switch B has the lowest MAC address (00-e0-fc-00-00-10), making it the root switch. (Reference: HCIA-Datacom Training Material, STP Root Bridge Election)

In IPv6, addresses with the FE80::/10 prefix are Link-Local Addresses.

Option A (Incorrect - Global unicast address): These have prefixes such as 2000::/3.

Option B (Incorrect - Multicast address): Multicast addresses start with FF00::/8.

Option C (Correct - Link-local address): FE80::/10 is reserved for Link-Local addresses, used for communication within a local link.

Option D (Incorrect - Anycast address): Anycast addresses are assigned to multiple interfaces but are not identified by a specific prefix.

Thus, the correct answer is C.

Detailed Explanation:In manual load balancing mode, all active interfaces forward traffic, distributing it evenly across links without LACP. This allows for static load balancing. Option B is incorrect because LACP (Link Aggregation Control Protocol) is not involved in manual mode. (Reference: HCIA-Datacom Training Material, Link Aggregation and Manual Load Balancing)