CCNA Exam combat skills

CCNA Exam combat skills
The most common test to the examination center:
(A) OSI seven-story structure system: it is necessary to know the role of each layer, a variety of applications, as well as all belonging to that level when the data flow through each layer (from top to bottom, bottom-up) plus HERDER and unpacking of .
(B) Frame Relay (FRAMERELAY) Application: CCNA certification exam as the Frame Relay Wide Area Network (WAN) part of the test content. You will encounter a large number of the test are the contents of frame relay. Therefore, you must be prepared to pay particular attention to the frame relay learning.
(3) ISDN issues: to know, such as TE-1, TE-2, NT-1, U interface (U-INTERFACE), B-CHANNAL, D-CHANNAL and a number of sub-channel (SUB-CHANNAL) and other terms (ISDN related to a particularly large number of terms and abbreviations, you must know the meaning and function of each), to understand the difference between BRI and PRI.
(D) clear AccessList: Learn DenyAccesslist of the inflow and outflow data flow constraints, the implied meaning of a clear DENYALL. Able to skillfully set limits by the subnet mask of the sub-network users.
(5) Ethernet switching: Familiar with Ethernet switch and exchange theory to understand the network sub-domains of conflict theory and VLAN.
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