Question 1

Which two commands display Power over Ethernet (PoE) power budget? (Choose two.)

Accepted Answer

B, E

Explanation: The show inline power command on a RUCKUS ICX switch provides a concise summary of the Power over Ethernet (PoE) status. This summary explicitly includes the total power budget, the currently consumed power, and the remaining available power. The show inline power detail command provides the same power budget summary as the base command but adds granular, per-port information, such as the port's priority, class, voltage, and current. Both commands are the most direct and specific tools for viewing the operational PoE power budget on the device.

Question 2

What is the maximum distance between ICX devices in a stack?

Accepted Answer

A

Explanation: RUCKUS ICX switches support long-distance stacking using standard Ethernet ports with optical transceivers. The maximum distance is dictated by the optic's capability. By using 10 GbE SFP+ or 40 GbE QSFP+ Extended Reach (ER) transceivers, which are specified for distances up to 40 kilometers, a stack can be created over a significant geographical area. This method utilizes standard single-mode fiber to connect stack members, for example, between different buildings on a large campus. While many documents specify a qualified distance of 10 km, the hardware's capability with ER optics defines the maximum potential distance.

Question 3

The root bridge is connected to another switch over two independent 10Gbe links. Which link will remain in a forwarding state on both sides?

Accepted Answer

B

Explanation: In Spanning Tree Protocol (STP), when a non-root switch has multiple, equal-cost links to the root bridge, it must select one port as its Root Port to forward traffic and block the others to prevent a loop. The selection is based on the Bridge Protocol Data Units (BPDUs) received from the root bridge. After path cost, the tie-breaker is the lowest Sender (Designated) Bridge ID, which is the same for both links. The next tie-breaker is the lowest Sender Port ID. The root bridge's port with the lowest number will have the lowest Port ID (assuming default priorities). The non-root switch will select its port connected to this link as its Root Port, keeping the link in a forwarding state on both ends.

Question 4

What are two features of Open Shortest Path First (OSPF)? (Choose two.)

Accepted Answer

B, D

Explanation: Open Shortest Path First (OSPF) is a link-state Interior Gateway Protocol (IGP). A core function of OSPF is to calculate the shortest path to a destination based on a cumulative metric called "cost." The cost is typically derived from the interface's bandwidth, and the path with the lowest total cost is installed in the routing table. As a dynamic routing protocol, OSPF continuously monitors the network topology. When a change occurs, such as a link failure, routers exchange Link State Advertisements (LSAs) to update their topological databases and recalculate the best routes, ensuring the routing table remains current and accurate.

Question 5

Which command enables global IPv6 capabilities?

Accepted Answer

B

Explanation: The ipv6 unicast-routing command is the fundamental global configuration command required to enable the IPv6 protocol stack on a RUCKUS ICX device. This command activates the device's ability to process and forward IPv6 unicast packets between its configured interfaces, effectively turning it into an IPv6 router. Without this command, the device will not perform Layer 3 forwarding for IPv6 traffic, even if IPv6 addresses are configured on its interfaces. It is the prerequisite for all other IPv6 routing functions.

Question 6

Which three objects can be assigned a Layer 3 address? (Choose three.)

Accepted Answer

D, E, F

Explanation: On RUCKUS ICX devices, a Layer 3 (IP) address can be assigned to logical or virtual interfaces to enable routing and IP-based management. Virtual Ethernet (VE): A VE is a logical Layer 3 interface that represents a specific VLAN, enabling inter-VLAN routing. Loopback: A loopback is a virtual interface that is always active. It is commonly used for stable router identification in routing protocols (like OSPF or BGP) and for management access. GRE tunnels: A Generic Routing Encapsulation (GRE) tunnel interface is a logical interface that encapsulates traffic over an IP network. The tunnel interface itself requires an IP address to establish the tunnel and route traffic through it.

Question 7

Which command can be used to identify Cyclic Redundancy Check (CRC) errors on port Ethernet 1/1/1?

Accepted Answer

A

Explanation: The show statistics ethernet 1/1/1 command is used on RUCKUS ICX switches to display detailed traffic and error counters for a specific interface. The output includes various metrics essential for troubleshooting, such as packet counts, broadcast/multicast traffic, and different types of errors. Among these are the Cyclic Redundancy Check (CRC) error counters, which are critical for identifying physical layer problems like faulty cabling, bad connectors, or malfunctioning network interface cards (NICs) that lead to frame corruption.

Question 8

Which ICX model has eight integrated QSFP28 ports?

Accepted Answer

B

Explanation: The Ruckus ICX 7850-48F is built for high-capacity core/aggregation roles and ships with 48 × 1/10/25 GbE SFP28 ports plus 8 × 40/100 GbE QSFP28 ports that are permanently integrated on the base chassis. None of the other listed ICX models provides eight onboard QSFP28 interfaces; they offer fewer QSFP28 ports or only QSFP+ (40 GbE) ports. Therefore, ICX7850-48F is the sole model in the options meeting the “eight integrated QSFP28 ports” requirement.

Question 9

A Core, Aggregation, Edge topology network is running Rapid Spanning Tree Protocol (RSTP). Two
switches at the edge are legacy and run 802.1D.
To influence the convergence time of the legacy switches at the edge, where are the timers
modified?

Accepted Answer

D

Explanation: In an 802.1D Spanning Tree Protocol (STP) domain, network-wide timers—specifically the Hello Time, Forward Delay, and Max Age—are determined and dictated by the root bridge. The root bridge embeds these timer values into the Bridge Protocol Data Units (BPDUs) it sends out. All other switches in the STP domain, including the legacy 802.1D switches, receive these BPDUs and adopt the timer values set by the root. To influence the convergence time for these legacy switches, the timers must be modified at their source, which is the root bridge, typically located at the network core in a Core/Aggregation/Edge topology.

Question 10

Which function is performed by ARP protocol?

Accepted Answer

A

Explanation: The Address Resolution Protocol (ARP) is a fundamental Layer 2 protocol used to map a known Layer 3 address (specifically an IPv4 address) to its corresponding Layer 2 physical address (such as a MAC address). When a device needs to send a packet to another device on the same local network, it uses an ARP request, broadcast to the network, to ask which device is using a specific IP address. The target device responds with an ARP reply containing its MAC address, allowing the source to build the complete Layer 2 frame for transmission.

Question 11

By default, how often are VRRP-E hello messages sent from the master?

Accepted Answer

C

Explanation: Virtual Router Redundancy Protocol-Extended (VRRP-E) is a RUCKUS proprietary protocol that provides router redundancy. The master router in a VRRP-E group periodically sends "hello" messages (advertisements) to inform backup routers of its operational status. By default, the master router sends these hello messages every 1 second. This interval allows backup routers to quickly detect a failure if they do not receive a hello message within the configured dead interval, which defaults to 3 seconds.

Question 12

For multicast clients to stop receiving traffic using a leave request, which protocol must run on the local subnet?

Accepted Answer

A

Explanation: 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.

Question 13

Which two processes are used to add a new stack member to an existing stack? (Choose two.)

Accepted Answer

B, E

Explanation: Ruckus FastIron documentation states that a new ICX switch can be inserted into an already-running stack in only two ways. 1. Interactive setup – the switch boots in standalone mode, the interactive-setup wizard assigns a unique stack-id, downloads the stack image and reboots to join. 2. Manual configuration – the administrator manually sets the stack-id, role, priority, and image, saves the configuration, then cables the stacking ports and reboots. No other procedures are identified by Ruckus as valid methods for initially adding a member.

Question 14

Which three conditions allow an ARP request or response to pass a Dynamic ARP Inspection (DAI) check? (Choose three.)

Accepted Answer

A, B, E

Explanation: Dynamic ARP Inspection (DAI) validates ARP packets to prevent ARP spoofing attacks. An ARP packet is permitted to pass a DAI check under three primary conditions. First, if the packet arrives on an untrusted port, its IP-to-MAC address binding is checked against the DHCP snooping database; a match allows the packet to pass. Second, for devices with static IP addresses, a manually configured static ARP entry (or ARP ACL) allows the corresponding ARP packets to be validated. Third, any ARP packet received on a port configured as "trusted" (e.g., an uplink to another switch or router) is permitted to pass without any inspection.

Question 15

Which device will become the root in the Spanning Tree election process?

Accepted Answer

C

Explanation: The Spanning Tree Protocol (STP) elects a root bridge for a Layer 2 network by comparing the Bridge IDs (BIDs) of all participating switches. The switch with the numerically lowest BID becomes the root bridge. The BID is an 8-byte value composed of a 2-byte Bridge Priority and the switch's 6-byte MAC address. The election process first compares the priority values; the lowest priority is preferred. If the priorities are identical, the switch with the lowest MAC address is chosen as the root bridge.

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