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In this lesson we will learn network interfaces.
Every interface between two network nodes is having an interface name that represents the protocol used in the communication between those nodes.
the interface between the eNB and the MME is called the S1-MME interface . and between the MME and the SGW, S11 . and between the MME and the HSS , S6a . and between the eNB and the SGW, S1-U . and between the SGW and the PGW , the S5/S8 . and finally between the PGW and the PDN, SGi .

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