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  • NACK vs. ACK? When to use one over the other one?
    It's faster if we just send NACK (n) for the lost packets instead of sending an ACK for each received packet So when which situations would one use ACK over NACK and viceversa?
  • Fast retransmit: NACK OR ACK? - Network Engineering Stack Exchange
    I have a question regarding fast retransmit For example if packet#9 is lost We send 3 ACK NACK#9 after each other But my question is, are we sending 3 acks or nacks in a row with fast retransmit?
  • DHCP - General relativity - Network Engineering Stack Exchange
    Not sure about general relativity, but yes, the DHCP server is the "source of truth" When a client reconnects to a network it was previously attached to, it may include the Requested IP Address field, offering a hint to the server that it would prefer it's old IP address back, however it may no longer be available (either due to the server leasing it back out to another client, or a client
  • Why does a Bluetooth header have both ACK and FLOW?
    I'm a little confused, couldn't flow control be performed just using the ACK field in the header? Why is there a FLOW bit as well?
  • TCP and Go-Back-N - Network Engineering Stack Exchange
    To add to the previous answer: A "Cumulative ACK" implies that all the bytes sent by the sender (so far) have been received correctly by the receiver In order words, when the sender receives an ACK with sequence number n, the receiver is telling the sender that it has received every byte up to and including n-1 and it is expecting byte n next In "selective ACKs", the receiver sends ACKs for
  • routing - Do we send ack frames in ethernet? if not then how does a . . .
    So first off, do ethernet sends ack frames or not? if it doesn't : then how does a router know whether its neighbors are down or not? if it does : then is it cumulative ack with an ack timer or o
  • Palo Alto Firewall: Why is double NAT needed?
    Double-NAT is not needed, and it should not be used Routers need to know where to send traffic Routers inherently know about directly-connected networks, but the need to be told where other networks are, either with static routing entries, or dynamically using a routing protocol Either put in a static route to the network on the other side of the firewall, or configure the router and
  • How do you configure a TACACS+ tac_plus server on Ubuntu 16. 04 that . . .
    How do you configure a TACACS+ tac_plus server on Ubuntu 16 04 that authenticates against Microsoft Active Directory?
  • SFP Modules Troubleshooting - Network Engineering Stack Exchange
    In one of our plants, we've got an issue with the SFP, where we are not able connect two 2960s via a Fiber Link My question is: are there any configation options, that can prevent the link to go u
  • Does authoritative DHCP server mean no static IP setting?
    This only deals with how the DHCP server responds to a client DHCP REQUEST for a certain IP address that is not provided by the DHCP server configuration If it isn't part of the DHCP scope on the Mikrotik and the setting is yes, then it responds with a DHCP NACK message, which should prompt the client to do a DHCP DISCOVER If set to no, then it will just ignore those packets (assuming that





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