Advantages and disadvantages of NIDS

Advantages of NIDS:

1. A few well-placed network-based IDS can monitor a large network.
2. The deploying of NIDSs has little impact upon an existing network. NIDSs are usually passive devices that listen on a network wire without interfering with the normal operation of a
3. NIDSs can be made very secure against attack and even made invisible to many attackers.

Disadvantages of NIDS:

1. NIDSs may have difficulty possessing all packets in a large or busy network and, therefore, may fail to recognize an attack launched during period of high traffic.
2. Many of advantages of NIDSs don’t apply to more modern switch-based networks.
3. NIDSs cannot analyze encrypted information. This problem is increasing as organizations and attackers use virtual private network.
4. Most NIDSs cannot tell whether or not an attack was successful; they can only find that an attack was initiated.