1. C, D and F. The big three WAN protocols are PPP, Frame Relay and HDLC. There are others, but CCNA does not cover them.
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2. B, D and E are correct. These ports are used by DNS, TFTP, and SNMP -- all of which use unreliable/connectionless UDP transport.
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3. D is correct. A will only support 2 hosts; B only 6 and C only 14. Watch out for the minus 2 in the host calculation! Answer C creates 16 hosts on the subnet, but we lose 2 -- one for the NET ID and one for the Broadcast ID.
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4. B is correct. A, C and D are either out of order or incorrect.
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5. D is correct. This would copy the IOS in flash memory to a TFTP server. A and B are incorrect because the IOS is stored in flash and not NVRAM. C is incorrect because copy tftp flash would upgrade your IOS from a TFTP server rather than copy your IOS to a TFTP server.
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6. A, C, E and F are correct. The on mode, off mode, auto mode and desirable mode are trunk port modes. B, D and G are incorrect; these other modes are not associated with trunking.
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7. B is correct. All odd-numbered hosts would have the one bit turned on in the last octet. Therefore, you need to check all hosts that have the one bit turned on (set to 1). You do not care about the other host bits. The default wild card mask for a /12 network is 0.0.15.255, but because you want to match only those hosts that have the one bit turned on, you will need a wildcard mask of 0.0.15.255.254 . A is incorrect because this would match both even and odd numbered hosts. C is incorrect because this would match all hosts from 10.48.0.0 through 10.48.255.0. D and E are incorrect because they have the wrong wildcard mask.
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8. E is correct. EIGRP is the only routing protocol that supports IP, IPX and AppleTalk. RIP, OSPF and IGRP are routing protocols that only support IP, so therefore the other choices are incorrect.
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9. A, B and D are correct. The LCP phase is responsible for the initial link-setup and negotiating options such as compression, callback, multilink and authentication. C is incorrect because this is not a component of LCP.
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10. False. Although it might be a good idea in many cases, route summarization is never mandatory (not counting routing protocols that automatically summarize).
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