What are three advantages of VLANs?（）
A. VLANs establish broadcast domains in switched networks.
B. VLANs utilize packet filtering to enhance network security.
C. VLANs provide a method of conserving IP addresses in large networks.
D. VLANs provide a low-latency internet working alternative to routed networks.
E. VLANs allow access to network services based on department, not physical location.
F. VLANs can greatly simplify adding, moving, or changing hosts on the network.
提示有脑膜炎存在的表现是头痛伴有（）
A. 发热
B. 精神症状
C. 眩晕
D. 癫痫样发作
E. Kernig征阳性
Since HTTP is one of the most common protocols used in the internet， what should be done at a firewall level to ensure thatthe protocol is being used correctly？ （）
A. Ensure that a stateful firewall allows only HTTP traffic destined for valid web server IP addresses.
B. Ensure that a firewall has SYN flood and DDoS protection applied specifically for valid web servers.
C. Ensure that your firewall enforces HTTP protocol compliance to ensure that only valid flows are allowed inand outof your network.
D. Ensure that HTTP is always authenticated.
Ensure that your web server is in a different zone than your backend servers such as SQL and DN
微信支付 
支付宝支付