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= ZScalar (Chd) =
DNS? need for DNS
Traffic troubleshooting
HTTP is in which layer?
DNS uses protocol? UDP & TCP
Why not use UDP for all DNS traffic? (Ans:Huge Overhead)
Reverse of DNS possible?
ScreenOS CPU utilization check command
Port no of DNS, SSH, HTTP
SSH access is there but WebUI not opening?
;2nd Level
302,403,401 error HTTP
SSL Handshake steps - 4 phases
Hashing vs Encryption, examples of protocols
Port Numbers - 80, 443
Proxy Server functions
ALG - Active vs Passive FTP
Destination NAT - Proxy ARP, Server issues, Debugging
If the Server does not have a reverse route to reach firewall,it will drop reply packet. Workaround is to create a Source NAT rule in firewall
Aggressive vs Main Mode
Is Preshared Key, ID shared in clear text in Aggressive mode? (no, its Hashed)
Dynamic IP in Site, Which mode is used? (Aggressive)
What is a Digital Signature?
= Convergys (JTAC L2) =
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