Cisco 010-151 Practice Test - Questions Answers, Page 15

The Subscriber Connector (SC), also known as the Standard Connector or Square Connector, is a type of fiber optic connector commonly used in data networking environments. It is frequently associated with multi-mode fiber optic cables, which are typically used for short to medium-range connections within data centers, campus networks, or building interconnections.

Here's a detailed look at each option:

1. Option A - straight-mode:

o This is not a recognized type of fiber optic cable. Fiber optic cables are generally categorized into single-mode and multi-mode, with no standard cable type called 'straight-mode.'

2. Option B - single-mode:

o Single-mode fiber (SMF) is used for long-distance communication, typically involving lasers and narrow core fibers. While SC connectors can technically be used with single-mode fiber, LC (Lucent Connector) connectors are more common in modern single-mode applications due to their compact size and improved performance for high-density connections.

3. Option C - dual-mode:

o 'Dual-mode' is not a correct term in fiber optics. Fiber optic cables are classified into single-mode and multi-mode, but 'dual-mode' is not used as a designation for any standard fiber optic cable type.

4. Option D - multi-mode:

o Correct. Multi-mode fiber (MMF) is commonly used with SC connectors. Multi-mode fiber is designed for shorter distances, and SC connectors are a standard choice for multi-mode fiber installations, especially in older infrastructure. Multi-mode fiber optic cables are commonly used within data centers and enterprise LAN environments for intra-building or intra-campus links where distances are generally shorter than with single-mode fiber.

Cisco Datacenter Networking Device

Reference:

* Cisco Network Switches and Modules: In data center environments, Cisco Nexus and Catalyst switches often support SC connectors with multi-mode fiber for short to medium-distance connections. Many Cisco SFP transceivers for multi-mode fiber are designed for SC or LC connectors.

* Fiber Optic Cabling Standards: SC connectors remain a staple in multi-mode fiber installations, particularly in legacy systems where this connector type was commonly used before the industry shift toward smaller form factor connectors like LC for higher-density applications.

In summary, multi-mode fiber (MMF) is typically used with a Subscriber Connector (SC), as SC connectors are common in multi-mode installations for data centers and enterprise environments.

In the Cisco UCS C240 M5 server, each labeled component has a specific role in the server's architecture:

1. mLOM (Modular LAN on Motherboard):

The component labeled 'B' in the exhibit corresponds to the mLOM slot. This slot is designed to provide flexible network connectivity options without occupying a standard PCIe slot. The mLOM can be used for Cisco's VIC (Virtual Interface Card) or third-party adapters, offering enhanced connectivity options for various network configurations in data center environments.

2. Explanation of the Other Options:

o PCle Riser 1 and PCle Riser 2: These are the expansion slots used for additional PCIe cards, allowing for enhanced storage, network, or GPU capabilities. These risers are typically located in other designated areas on the motherboard, not in the position marked as 'B.'

o Rear 2.5-inch Drive Bays: Located at the back of the server, these bays provide additional storage options but do not align with the area marked as 'B' in the image.

The mLOM in position 'B' provides a modular approach to network connectivity, crucial for high-performance workloads and data center flexibility. This component placement aligns with Cisco's modular design philosophy, ensuring adaptability and scalability in UCS C-Series Rack Servers like the C240 M5.

In a Cisco UCS environment, ensuring high availability (HA) between clustered Fabric Interconnects is essential for operational resilience. There are specific commands used to check the HA state of these Fabric Interconnects:

show cluster state: This command provides a basic view of the cluster status between the two Fabric Interconnects. It shows whether the cluster is in a primary or subordinate state and provides information about each Fabric Interconnect's role. This is a fundamental command used for checking the general state of the cluster.

show cluster extended-state: This command provides a more detailed view of the cluster's HA status, offering extended information about the cluster's synchronization status, heartbeat status, and any potential issues. It helps in diagnosing more granular details of the cluster's health and HA status.

Explanation of Incorrect Options:

show cluster HA state and show cluster HA status: These are not valid commands in the Cisco UCS command-line interface.

show cluster state extended: While similar in wording, this is also not a valid command in Cisco UCS for viewing HA status.

Summary:

To verify the high availability state between two clustered Fabric Interconnects, use show cluster state for a general status overview and show cluster extended-state for a detailed diagnostic view. These commands are essential for UCS administrators to ensure that the Fabric Interconnects are operating in a healthy and synchronized HA configuration.

In Cisco UCS servers, the System Status LED (often referred to as item 7 in diagrams) indicates various statuses depending on its color and blinking pattern. A blinking red System Status LED typically indicates that the server has encountered a critical issue during the Power-On Self-Test (POST) process. POST is a diagnostic testing sequence performed by the system's firmware after the server is powered on, checking essential hardware components for functionality before allowing the boot process to proceed.

Explanation of Other Options:

Major fault with the system board: While a system board issue could cause the system to fail POST, a specific fault with the system board would not necessarily result in a blinking red System Status LED on its own.

Secure boot validation has failed: Secure boot validation issues would likely result in a different LED pattern or alert, typically involving specific secure boot status indicators rather than a general blinking red status.

Major fault with memory DIMM: A memory issue could cause the POST to fail, but the POST failure itself is what triggers the blinking red LED status.

Summary:

A blinking red System Status LED (item 7) in Cisco UCS systems generally indicates that the Power-On Self-Test (POST) has failed, preventing the server from booting due to a critical hardware issue detected during startup diagnostics.