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How can spanning tree loops be prevented in the backbone of this network?

You work as a network engineer at domain .com. Study the topology exhibit carefully. L3 switches domain .com 1 and domain .com 2 are in the backbone of the network. They are connected by a routed EtherChannel bundle consisting of eight Gigabit Ethernet ports. The routed link is represented as subnet X.0 in the diagram. Since X.0 is routed, it is not a VLAN trunk. How can spanning tree loops be prevented in the backbone of this network?
Exhibit:

which lines are required (by RFC) for an HTTP 1.1 request?

GET / HTTP/1.1rn Connection: Keep-Alivern User-Agent: Mozilla/4.8 [en]C-CCK-MCD (Windows NT 5.0; U)rn Host: www.cisco.comrn Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png, */*rn Accept-Encoding:
gziprn Accept-Language: enrn Accept-Charset: iso-8859-1,*,utf-8rn In the above listed HTTP request, which lines are required (by RFC) for an HTTP 1.1 request?