This sounds suspiciously like a homework question, but I'll answer anyway.....

Do firewall rules have to be symmetric?

No.

That is, does a firewall have to block a particular traffic type both inbound (to the protected site) and outbound (from the site)?

No.

Why or why not?

I've somewhat answered that question here: Firewall & TCP Traffic

The reason is that modern firewalls are stateful, which means that communication is free to flow both ways once initiated from the allowed source to the allowed destination over the allowed port and/or service.

This is the reason why a symmetric rule is not necessary.

This sounds suspiciously like a homework question, but I'll answer anyway.....

Do firewall rules have to be symmetric?

No.

That is, does a firewall have to block a particular traffic type both inbound (to the protected site) and outbound (from the site)?

No.

Why or why not?

I've somewhat answered that question here: Firewall & TCP Traffic

The reason is that modern firewalls are stateful, which means that communication is free to flow both ways once initiated from the allowed source to the allowed destination over the allowed port and/or service.

This is the reason why a symmetric rule is not necessary.

This sounds suspiciously like a homework question, but I'll answer anyway.....

Do firewall rules have to be symmetric?

No.

That is, does a firewall have to block a particular traffic type both inbound (to the protected site) and outbound (from the site)?

No.

Why or why not?

I've somewhat answered that questions here: Firewall & TCP Traffic

The reason is that modern firewalls are stateful, which means that communication is free to flow both ways once initiated from the allowed source to the allowed destination over the allowed port and/or service.

This is the reason why a symmetric rule is not necessary.

This sounds suspiciously like a homework question, but I'll answer anyway.....

Do firewall rules have to be symmetric?

No.

That is, does a firewall have to block a particular traffic type both inbound (to the protected site) and outbound (from the site)?

No.

Why or why not?

I've somewhat answered that question here: Firewall & TCP Traffic

The reason is that modern firewalls are stateful, which means that communication is free to flow both ways once initiated from the allowed source to the allowed destination over the allowed port and/or service.

This is the reason why a symmetric rule is not necessary.