Packet filtering firewall and stateful inspection firewall

Assignment Help Computer Network Security

Reference no: EM13699560

Quesiton 1: The following code fragments show a sequence of virus instructions and a metamor-phic version of the virus. Describe the effect produced by the metamorphic code.

Original Code

Metamorphic Code

mov add call

eax, eax, [eax]

5 ebx

mov push pop add swap swap call nop

eax, ecx ecx eax, eax, ebx, (eax)

ebx
ebx
eax

Quesiton 2: What type of malware is the following code fragment?

legitimate code

if data is Friday the 13th;

crash computer(); legitimate code

Quesiton 3: Consider the following fragment in an authentication program and determine what type of malicious software this is.

username = read_usernamen ;

password = read_password0 ;

if username is "133t h4ckOr"

return ALLOW_LOGIN;

if username and password are valid

return ALLOW_LOGIN

else return DENY_LOGIN

Quesiton 4: What is the difference between a packet filtering firewall and a stateful inspection firewall? 12.6 What is an application-level gateway?

Reference no: EM13699560

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