Which scenario represents a problem at Layer 4 of the OSI model?
- An incorrect IP address on the default gateway.
- A bad subnet mask in the host IP configuration.
- A firewall filtering traffic addressed to TCP port 25 on an email server.
- An incorrect DNS server address being given out by DHCP.
Exam with this question: CCNA Discovery 2: DsmbISP Chapter 2 Exam
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