At which layer of the OSI model is RSTP used to prevent loops?（）
第1题：
A. Layer 2
B. Layer 3
C. Layer 4
D. Layer 7
第2题：
A.Layer 1
B.Layer 5
C.Layer 6
D.Layer 7
第3题：
As a CCNA candidate, you will be expected to know the OSI model very well. Which of the following are associated with the application layer (layer 7) of the OSI model? (Choose two)
A. TCP
B. Telnet
C. FTP
D. Ping
E. IP
F. UDP
第4题：
At which layer of the OSI model dose PPP perform?（）
第5题：
A.Application
B.Internet
C.Transport
D.Network
E.Data Link
第6题：
A. Application Layer
B. Presentation Layer
C. Data Link Layer
D. Physical Layer
第7题：
A.Layer two
B.Layer four
C.Layer one
D.Layer three
第8题：
Acknowledgements, sequencing, and flow control are functions that are handled by which layer of the OSI model?
A. Layer 5
B. Layer 4
C. Layer 7
D. Layer 6
E. Layer 3
F. Layer 2
G. Layer 1
第9题：
ICMP and IGMP belong to which layer of the OSI model? ICMP和IGMP协议在OSI模型中属于那层？（）
第10题：
At Layer 2 of the OSI model, which component connects a host to the network media?（）