.
FTP
SSH
SMTP
HTTP
SSH
FTPS
SNMPv3
TLS
Support voice and video transmissions
Provide time synchronization
Enable email usage
Encrypt data-in-transit
SMTP
TLS
SFTP
SRTP
Flood guard
SNMPv3
SRTP
RSTP
Install an IDS.
Only use Layer 2 switches.
Install SNMPv3 on the switches.
Implement STP or RSTP.
The new service
An ACL
ServerA
The VLAN
Wireless access point
Firewall
Layer 2 switch
Bridge
Create rules to block all outgoing traffic from a private IP address.
Implement a flood guard on switches.
Add a web application firewall.
Create rules to block all incoming traffic from a private IP address.
Stateless firewall
Stateful firewall
Network firewall
Application-based firewall
DMZ
VLAN
Firewall
WAF
Transparent proxy
Reverse proxy
Nontransparent proxy
Caching proxy
Content inspection
Malware inspection
URL filter
DDoS mitigator
Within the DMZ
At the border of the network, between the intranet and the DMZ
At the border of the network, between the private network and the Internet
In the internal network