You just discovered that a ping packet sent from one of the devices to another took a different path in the return than it did on its way to the destination. What behavior caused this?

Last Updated on July 31, 2021 by Admin 1

You just discovered that a ping packet sent from one of the devices to another took a different path in the return than it did on its way to the destination.

What behavior caused this?

  • Windowing
  • Global synchronization
  • MSS
  • Asymmetric routing
Explanation:
This behavior is caused by asymmetric routing. This is quite common in a routed network and usually is not a problem. It can, however, become an issue when firewalls reside in a routed path. Firewalls can cause problems when they maintain state information about connections. State information is used to determine if return connection is allowed. If the return path is routed through a different firewall, it will not have the correct state information for the connection, and the return will be disallowed.It is not caused by windowing. This is a technique used to adjust the number of packets that can be acknowledged at once by a receiving computer in a transmission. In times of congestion, the window or number of packets that can be acknowledged at a time will be small. Later, when congestion goes down, the window size can be increased.The behavior is not caused by the maximum segment size (MSS). This value specifies the largest amount of data, in octets, that a computer or communications device can receive in a single TCP segment. This will not cause a packet to take a different path in the return than it did on its way to the destination.The behavior is not caused by global synchronization. This occurs when congestion on the network causes all devices to reduce their transmission rates at the same time. The result is the network cycling between sharp increases and sharp decreases in traffic.

Objective:
Network Principles
Sub-Objective:
Explain TCP operations

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