Since HTTP is one of the most common protocols used in the i

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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.
• E、 Ensure that your web server is in a different zone than your backend servers such as SQL and DNS.

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At one time（）was called Classical Method since it was first used in the teaching of the classical languages of Latin and Greek.
the grammar-translation method
略

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IP routing protocols， such as OSPF and Enhanced EIGRP， are used primarily in network designs that contain entry and exit points to the network from service providers. What is a common trait of IP routing  protocols？（）  

• A、 They add needed overhead in smaller deployments.
• B、 They are essential for optimum and redundant forwarding.
• C、 They are used primarily in larger network designs，to support different networks and single entry and  exit points.
• D、 They are usually necessary in smaller deployments.

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Which one of the WAN data-link protocols below is used for out-of-band signaling?（）

• A、HDLC
• B、NCP
• C、PAP
• D、LAPD
• E、LAPB
• F、None of the above