You deployed new fibers in your network to replace copper spans that were too long. While reconnecting the network， you experienced network problems because you reconnected wrong fibers to wrong ports. What could you do to prevent this type of problem in the future， particularly when connecting and reconnecting fiber pairs？ （） Only use fiber in pairs.。 Configure root guard on your switches.。 Do not use fiber but use copper.。 Configure UDLD to prevent one-way link conditions.。
构成路基的三要素是（） 路基宽度。 地面横坡度。 路基高度。 路基边坡坡度。
In order to configure two routers as anycast RPs，which of these requirements，at a minimum， must be satisfied？（） Multicast Source Discovery Protocol mesh-groups must be configured between the two anycast RPs.。 The RPs must be within the same IGP domain.。 Multicast Source Discovery Protocol must be configured between the two anycast RPs.。 The two anycast RPs must be IBGP peers.。
LPS
While deploying a new switch， you accidently connect ports 3/12 and 3/18 together， creating a loop. STP detected it and placed port 3/18 in blocking mode. Why did STP not place port 3/12 in blocking mode instead？ （） Port 3/12 was already up and forwarding before the loop was created.。 Port priority is based on lowest priority and lowest port number.。 You connected the wire on port 3/18 last.。 None of the above， it is purely random.。
磁铁矿属于（）。
