Newly Released Fortinet EMEA-Advanced-Support Exam PDF

The TCP MSS (Maximum Segment Size) defines the maximum TCP payload size, excluding headers. When the firewall sets MSS to 1450 bytes, the TCP segment size is limited to this value. For IP packets, the total size includes the TCP header (20 bytes) and IP header (20 bytes), so 1450 (MSS) + 20 (TCP) + 20 (IP) = 1490 bytes, which fits within both link MTUs (1500 and 1496 bytes). Thus, the maximum IP packet size is not limited by the link MTUs but by the MSS, adjusted for headers. Options C and F (bits) are incorrect units; A and B exceed the MSS limit. Exact extract: "The TCP MSS is adjusted to prevent fragmentation... FortiGate can rewrite the MSS in TCP SYN packets to ensure the total IP packet size (including IP and TCP headers) does not exceed the configured value."

TCP is a unicast, connection-oriented protocol that ensures reliable data delivery between two endpoints using sequence numbers and acknowledgments. Multicast, which sends data to multiple recipients, is supported by UDP, not TCP, due to TCP’s requirement for a direct connection. Fortinet devices handle multicast traffic via UDP-based protocols like IGMP or PIM. Exact extract: "TCP is a unicast protocol that establishes a reliable connection between two devices... Multicast traffic, such as streaming or group communications, relies on UDP, as TCP does not support multicast delivery."

In a FortiGate HA cluster (active-active or active-passive), if the primary unit fails, a secondary unit automatically takes over as the primary, ensuring continuity of traffic with minimal disruption. Option A is incorrect as traffic continues, C is incorrect as the mode doesn’t change post-failure, and D is unrelated. Exact extract: "In a FortiGate HA cluster, if the primary unit fails, a secondary unit is elected as the new primary, taking over all roles to maintain traffic flow and session continuity."

Auto Discovery VPN (ADVPN) in FortiGate enables dynamic routing protocols (e.g., OSPF, BGP) to propagate updates through IPsec VPN tunnels by automatically creating shortcut paths between spokes. This simplifies configuration and enhances scalability in hub-and-spoke topologies. Route-based VPN (D) supports routing but not dynamic discovery, VRF (C) is for segmentation, and Dynamic Routing Gateway (B) is not a standard Fortinet feature. Exact extract: "ADVPN allows dynamic routing protocols to be used over IPsec VPN tunnels, enabling spokes to discover and communicate directly via shortcuts, improving efficiency in hub-and-spoke setups."