ccna questions seem to have wrong answers can you confirm

i have a book that is sketching me out for icnd1
can you tell me if this is right or wrong.
examples of questions that dont make sense to me.

what is the purpose of a switch?
a..is not right (dont worry)
b is not right (dont worry)
c to serve as an endpoint in the network, sending and receiving data
d to provide network attchement to the end systems and intelligent swithcin of the data within the local network

the book says the correct answer is c.......

what is the purpose of interconnections

a not right dont worry
b not right dont worry
c to provide a maeans for the data to travel from one point to another in the network
d to provide network attachment to the end systesm and intelligent swithcing of the data within the network.

the book says the right answer is d.....

it says that tcp operates at layer 3 of the tcp/ip model which seems true to me
it says the answer is false
layer 1 is link
2 is internet
3 is tcp
4 is application

 am i right?/
can someone confirm
jamesmetcalf74Asked:
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Ken BooneNetwork ConsultantCommented:
what is the purpose of a switch?
a..is not right (dont worry)
b is not right (dont worry)
c to serve as an endpoint in the network, sending and receiving data
d to provide network attchement to the end systems and intelligent swithcin of the data within the local network

D  book is wrong!


what is the purpose of interconnections

a not right dont worry
b not right dont worry
c to provide a maeans for the data to travel from one point to another in the network
d to provide network attachment to the end systesm and intelligent swithcing of the data within the network.

C book is wrong!


it says that tcp operates at layer 3 of the tcp/ip model which seems true to me
it says the answer is false
layer 1 is link
2 is internet
3 is tcp
4 is application

Book is correct here.  This is in reference to the 4 layer TCP/IP model NOT the 7 layer OSI model which everyone generally uses for these discussions.  So TCP is layer 4 in the OSI but layer 3 in the TCP/IP model.
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AustinComputerLabsCommented:
I believe the first two are incorrect in the book.

the third is a bit tricky:
The Transmission Control Protocol (TCP) operates at layer 4 of the OSI model. ... The layer below TCP is the Internet Protocol (IP) at layer 3.
from: http://www.tcpipguide.com/TCPIPGuide_2-0_s2.pdf
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jamesmetcalf74Author Commented:
thanks guys
it makes me wonder if there arent  a lot more questions in this book that are wrong

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