interview L1/L2 Answer 1. What is BPDU Guard? BPDU (Bridge Protocol Data Unit) Guard is a feature in networking that is used to protect the network from potential loops. It disables a port when a BPDU is received on a port that is configured with PortFast, which is typically used for end devices like computers. By disabling the port, BPDU Guard helps to prevent misconfigurations and potential loops in the network. 2. What is loop-back detect? Loop-back detection is a network feature that helps to identify and mitigate network loops. Network loops can cause broadcast storms and network congestion. Loop-back detection mechanisms typically send out special frames to detect loops in the network topology and, upon detection, disable the affected ports to prevent the loop from impacting the network. 3. What is the Spanning Tree Protocol (STP)? How are loops avoided in STP? The Spanning Tree Protocol (STP) is a network protocol that ensures a loop-free topology for Ethernet networks. STP avo
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QNA FOR MICROWAVE What's the frequency range of E band and traditional? The E band, or millimeter-wave band, typically ranges from 60 GHz to 90 GHz. Traditional microwave frequency bands are commonly categorized into various bands such as C band (4 GHz to 8 GHz), X band (8 GHz to 12 GHz), Ku band (12 GHz to 18 GHz), and Ka band (26.5 GHz to 40 GHz). Can you explain XPIC (Cross Polarization Interference Cancellation) technology? XPIC (Cross Polarization Interference Cancellation) is a technology that involves transmitting two signals with orthogonal polarizations on the same frequency. By doing so, it helps reduce interference between signals and improves overall communication reliability and capacity. What's the difference between FD (Frequency Division) and SD (Space Division)? FD (Frequency Division) involves dividing the available frequency spectrum into multiple channels, each assigned to a specific communication link. SD (Space Division) refers to using physically separa