choose and explain the correct answer

subject : Networks

note : I need ans within 15 min

In a 9 node mesh, we need duplex physical links of: 1 32 72 56 36 For selective repeat ARQ with 5 bit sequence number, the maximum receiving window size is: 32 16 8 0 1 Which multiple access technique is used by IEEE 802.5 standard for wireless LAN? token ting reservation CDMA/CD Opolling In OSI network architecture, the hop to hop delivery is performed by session layer data link layer transport layer network layer Connection in which multi devices share a single link is called: Spatially shared O Multipoint O Point to point O Time Shared In Go-back n ARQ, if frames 2, 3, and 4 are received successfully, the receiver may send back to the sender ACK: O 3 O Difficult reconnection and fault isolation are disadvantages of Mesh topology Star topology Ring topology Bus topology Source first makes a connection with destination before sending a packet in Connection-oriented service Unguided Connection Connectionless service all of the these Which one of the following event is not possible in wireless LAN? Collision detection Acknowledgement of data frames Multi-mode data transmission None of the mentioned