Internet Group Management Protocol Version 2 (IGMPv2) introduced the explicit "Leave Group" message. This feature allows a multicast client to actively send a request to the local multicast router, signaling its intent to stop receiving traffic for a particular multicast group. Upon receiving this message, the router can initiate a query to see if any other members remain on the subnet. This makes the process of leaving a group significantly faster and more efficient compared to IGMPv1, which relies on a passive timeout mechanism where the router must wait to stop forwarding traffic.

B. IGMPv1: This version lacks an explicit "Leave Group" message. A host simply stops responding to membership queries, and the router only stops forwarding traffic after a timeout period expires.

C. PIM Dense: This is a multicast routing protocol that operates between routers to build distribution trees. It is not used by end-clients on the local subnet to manage group membership.

D. IGMP Snooping: This is a Layer 2 switch feature that optimizes multicast traffic delivery by listening to IGMP messages. It is not the protocol used by the client to send the leave request.

1. RUCKUS FastIron Layer 3 Routing Configuration Guide, 08.0.95, Chapter 25: Configuring IP Multicast, section "IGMPv2", page 628. The document states, "IGMPv2 adds a Leave Group message to the protocol. When a host wants to leave a multicast group, it sends a Leave Group message to the all-routers multicast group (224.0.0.2)."

2. IETF RFC 2236, "Internet Group Management Protocol, Version 2", November 1997, Section 1: Introduction. This RFC, which defines the protocol, explicitly states: "Version 2 of IGMP adds a 'leave group' message to allow a host to inform a router that it wishes to leave a multicast group..."

3. Kurose, J. F., & Ross, K. W. (2017). Computer Networking: A Top-Down Approach (7th ed.). Pearson. In Chapter 4, Section 4.7.2, the text explains the IGMP protocol, noting that IGMPv2 (and v3) added messages that allow a host to explicitly signal it is leaving a group, an improvement over IGMPv1's timeout-based approach.

The RUCKUS ICX 7150-C12P is a compact switch that supports Power over Ethernet Plus (PoE+), compliant with the IEEE 802.3at standard. This standard specifies a maximum power delivery of 30W per port from the Power Sourcing Equipment (PSE). The other listed models (ICX7650, ICX7550, and ICX7150-48ZP) all support higher power standards such as IEEE 802.3bt or Power over HDBaseT (PoH), which allow them to deliver up to 90W per port, thus exceeding the 30W limit.

A. ICX7650: This model supports Power over HDBaseT (PoH), which can deliver up to 90W per port, far exceeding the 30W maximum.

B. ICX7550: This switch series includes models that support the IEEE 802.3bt standard, enabling power delivery of up to 90W on dedicated ports.

C. ICX7150-48ZP: This specific model is a Z-series switch that supports IEEE 802.3bt (PoH), providing up to 90W per port to power high-power devices.

1. RUCKUS ICX 7150 Family Data Sheet. In the "RUCKUS ICX 7150 Switch Models" table, the ICX 7150-C12P is listed with "12× 10/100/1000 Mbps PoE+ ports". The ICX 7150-48ZP is listed with "16× 10/100/1000/2500 Mbps 802.3at/bt (PoH) ports". This document confirms the ICX7150-C12P is limited to PoE+ (30W) while the ICX7150-48ZP supports 802.3bt (up to 90W). (Document available via the official CommScope/RUCKUS website).

2. RUCKUS ICX 7650 Switch Data Sheet. Under "Product Highlights," it states, "Power over HDBaseT (PoH) up to 90 watts per port and IEEE 802.3bt ready, PoE/PoE+." This confirms its ability to exceed 30W per port. (Document available via the official CommScope/RUCKUS website).

3. RUCKUS ICX 7550 Switch Series Data Sheet. The "At a Glance" section specifies, "802.3bt (90W) PoE on dedicated ports to power next generation wireless APs and IoT devices." This confirms its capability to exceed 30W per port. (Document available via the official CommScope/RUCKUS website).

The access point requires the switch port to handle two traffic types: untagged management traffic on the default VLAN (VLAN 1) and 802.1Q tagged guest traffic on VLAN 10. On RUCKUS ICX switches, all ports are, by default, untagged members of VLAN 1. This default state already accommodates the AP's management traffic. The only required change is to add the guest traffic VLAN. The command vlan 10 tagged ethernet 1/1/10 adds port 1/1/10 as a tagged member of VLAN 10, allowing it to process the tagged guest traffic while retaining its default untagged membership in VLAN 1 for management.

A. This command incorrectly configures VLAN 10 for untagged traffic, but the AP will send guest traffic with a VLAN 10 tag.

B. This command removes the port's untagged membership from VLAN 1, which is the management VLAN. This would prevent the AP from communicating with the management network.

D. This command removes untagged membership from VLAN 10. It is an irrelevant action that does not configure the necessary tagged membership for the port.

1. RUCKUS FastIron Layer 2 Switching Configuration Guide, Release 08.0.95, Chapter 3: Configuring VLANs, Page 48, Section: "Default VLAN and default port configuration".

This section states: "By default, all ports on the device are members of the default VLAN (VLAN 1)." This confirms that the port is already correctly configured for the untagged management traffic without any explicit commands.

2. RUCKUS FastIron Layer 2 Switching Configuration Guide, Release 08.0.95, Chapter 3: Configuring VLANs, Page 51, Section: "Adding a port to a VLAN as a tagged member".

This section provides the exact syntax used in the correct answer: vlan followed by tagged ethernet . This command adds the port to the specified VLAN for handling 802.1Q tagged frames, which is the requirement for the guest SSID traffic.

3. RUCKUS FastIron Layer 2 Switching Configuration Guide, Release 08.0.95, Chapter 3: Configuring VLANs, Page 50, Section: "Removing a port from a VLAN".

This section explains the use of the no untagged ethernet command, confirming that its use in option B would remove the port from VLAN 1, thereby breaking management connectivity.

The Link Layer Discovery Protocol (LLDP) is a vendor-neutral protocol used by network devices to advertise their identity, capabilities, and neighbors on a LAN. The show lldp neighbors command on a RUCKUS ICX switch displays a summary of the information received from directly connected LLDP-enabled devices. This output specifically includes the "System Name" (hostname) of each neighboring device, making it the correct command to discover this information.

B. show chassis: This command displays hardware information about the local switch itself, such as its serial number, power supplies, and fan status, not information about attached devices.

C. ping: This is a Layer 3 utility used to test IP reachability to a known IP address or hostname. It does not discover the names of unknown attached devices.

D. show inline power: This command displays the Power over Ethernet (PoE) status for switch ports, including power allocation and consumption, not the system name of the connected device.

1. RUCKUS FastIron Command Reference Guide, 8.0.95:

Page 1519, "show lldp neighbors": This section describes the command and provides sample output. The output table explicitly includes a "System Name" column, which "Displays the system name of the neighbor device." This directly supports answer A.

Page 2011, "show chassis": This section details the command, stating it "displays information about the chassis, including the card cage type, serial number, and power supplies." This confirms the command is for the local device, making B incorrect.

Page 2067, "show inline power": This section describes the command's function to display "information about inline power." This confirms D is incorrect.

The IEEE 802.3bt standard, also known as PoE++ or 4PPoE, significantly increases the power available to end devices. It introduces two new types: Type 3 (up to 60W from the Power Sourcing Equipment - PSE) and Type 4 (up to 90W from the PSE). To manage these higher power levels, the standard extends the classification system defined in previous standards (802.3af/at). The 802.3bt standard defines power classes from 0 to 8. Class 8 is the highest, corresponding to Type 4 devices, and ensures a minimum of 71.3W of power is available at the Powered Device (PD).

B. Class 4 is the highest power class supported by the older IEEE 802.3at (PoE+) standard, not 802.3bt.

C. Class 1 is a valid, low-power class in all PoE standards but is not the highest class available.

D. 16 is not a valid power class defined by any of the IEEE 802.3 PoE standards.

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1. Official Vendor Documentation (CommScope/RUCKUS):

CommScope. (2020). Power over Ethernet (PoE) in the Enterprise. White Paper (WP-113260-EN). In the table "PoE standards at a glance" on page 3, it clearly shows that IEEE 802.3bt supports Classes 0-8 and delivers up to 71W at the PD for Class 8.

2. Peer-reviewed Academic Publications / Standards Body:

IEEE Std 802.3-2018, IEEE Standard for Ethernet, Section 10, Clause 145. "Type 3 and Type 4 Class and Type discovery, and power control". Table 145-1, "PD power classification," explicitly lists power classes 1 through 8, with Class 8 having a PClassPD range of > 60W to 71.3W.

3. University Courseware / Reputable Institutions:

University of New Hampshire InterOperability Laboratory (UNH-IOL). PoE Classes, Types, and Topologies. This resource, from a leading PoE testing and certification body, includes a table titled "PoE Standards" which specifies that IEEE 802.3bt-2018 includes Classes 5, 6, 7, and 8, with Class 8 being the maximum.