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What part of my answer was incomplete?
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Your answer was just fine. Sorry, I mean no disrespect.
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You should read the <a href="http://support.experts-exchange.com/customer/portal/articles/481419-what-grade-should-i-award-?b_id=44" rel="ugc nofollow">grading guidelines</a>.<br />
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B is the grade given for acceptable solutions, or a link to an acceptable solution. <b>A B grade means the solution given lacked some information or required you to do a good amount of extra work to resolve the problem.</b> When closing the question, the asker should explain why a B grade was awarded.
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Hi, have few questions. Can you please answer ? <br />
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1. Why is it required to have all links of same speed, type and duplex settings to be grouped into a Etherchannel. Why not have different link speeds participate in a Etherchannel group and what are the actual effects of having different speed links in a Etherchannel. Will it have impact on performance ? <br />
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2. Can we configure STP and RSTP on the same switch ? Can we configure STP and RSTP on interface level ? And what will happen if we connect STP and RSTP switches back-to-back. What will be port states/roles on RSTP switch ? <br />
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Thanks !
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Hi, have few questions. Can you please answer ? 

1. Why is it required to have all links of same speed, type and duplex settings to be grouped into a Etherchannel. Why not have different link speeds participate in a Etherchannel group and what are the actual effects of having different speed links in a Etherchannel. Will it have impact on performance ? 

2. Can we configure STP and RSTP on the same switch ? Can we configure STP and RSTP on interface level ? And what will happen if we connect STP and RSTP switches back-to-back. What will be port states/roles on RSTP switch ? 

Thanks !

Networking - Etherchannel/STP

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switches / Hubs

Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functionality of the operating system. The best known frameworks are the TCP/IP model and the OSI model. Systems typically do not use a single protocol to handle a transmission. Instead they use a set of cooperating protocols, sometimes called a protocol family or protocol suite.[9] Some of the best known protocol suites include: IPX/SPX, X.25, AX.25, AppleTalk and TCP/IP. Other protocols indirectly related to networking include the hypertext transfer protocol (HTTP) and its related technologies, Dynamic Host Configuration Protocol (DHCP), Domain Name Server (DNS) and other Internet protocols.