What material is the yellow outer layer of the optical cable made of
Kevlar® is the registered trademark for the strong synthetic material or yellow 'hair' used as a protective outer sheath for the glass fiber core it protects. Its high tensile strength protects the cable from damage when being pulled. Structurally, a fiber cable comprises the core, cladding, coating, strength member, and outer jacket. The fiber jacket protects against moisture, UV exposure, chemicals, and mechanical abrasion. Larger core sizes allow a larger amount of light, or a larger beam diameter, to enter the fiber. The numerical aperture. A fiber-optic cable, also known as an optical-fiber cable, is an assembly similar to an electrical cable but containing one or more optical fibers that are used to carry light. Many factors influence the design of fiber-optic cables. [pdf]
Port Security of Access Layer Switches
Port Security is a layer 2 access control feature that allows network administrators to control which devices can connect to a specific switch port. It does this by restricting the MAC addresses allowed on that port and defining how the switch reacts to unauthorized devices. Let's consider the following example. Imagine an open office space with desks everywhere. What stops someone with access to the office from unplugging a device at an empty desk and plugging their rogue device into the wall jack, as shown in the diagram?Catalyst Integrated Security Features (CISF) includes private VLANs, port security, DHCP snooping, IPSource Guard, secure Address Resolution Protocol (ARP) detection, and dynamic ARP inspection. [pdf]FAQs about Port Security of Access Layer Switches
How to Configure Port Security
To configure port security we need to access the command prompt of switch. Click Switch and click CLI and press Enter Key.Port can be secure from i...
Switchport Port-Security Violation
We need to specify what action; it should take in security violation. Three possible modes are available:Protect: - This mode will only work with s...
Switchport Port Security Example
In our topology PC0 is connected with F0/1 port of switch. Enter following commands to secure F0/1 port.Following table explains above commands in...
Switchport Port Security Testing
In our topology we have one additional PC. Assume that, this is the cracker's PC. To gain unauthorized access in network he unplugged the Ethernet...
What is the inner layer of a fiber optic patch cord made of
A fiber-optic patch cord is constructed from a core with a high refractive index, surrounded by a coating with a low refractive index, that is strengthened by aramid yarns and surrounded by a protective jacket. This is known as interconnect-style cabling. When searching for a fiber optic cable, we need to pay attention not only to the connectors, such as SC to ST fiber cable, LC to SC fiber patch cable, or SC to. The five main parts of a fiber optic cable are: Glass: The core component where light travels to carry data. Fiber Core: A thin strand of glass or plastic, typically measured in microns, that is the primary pathway for light transmission. Smaller core = longer distance, less dispersion. [pdf]