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質問 # 155
Refer to the exhibits.
The routing tables of FortiGate_A and FortiGate_B, and a network topology are shown.
Why does FortiGate_B have only one external route available to 100.75.5.1/32?
正解：B
解説：
The issue described is a classic OSPF path selection behavior dictated by the version of the OSPF standard the device is following.
* RFC 1583 vs. RFC 2328:
* RFC 1583: This older standard does not distinguish between intra-area and inter-area paths when calculating the cost to an ASBR (Autonomous System Boundary Router) or an external route.
* RFC 2328: This newer standard (which is the default behavior in FortiOS 7.6) introduces a preference for intra-area paths over inter-area paths to an ASBR. This is designed to prevent routing loops that could occur in specific complex topologies.
* Analysis of the Exhibits:
* FortiGate_A (HQ): Its routing table (image_bd08a0.jpg) shows two equal-cost paths (O E2) to the external destination 100.75.5.1/32, one via ISP1 (10.0.1.1) and one via ISP2 (10.0.11.1).
* FortiGate_B (Branch): Its routing table (image_bd08a4.jpg) only shows a single path via FortiGate_A (10.0.2.1).
* Topology: FortiGate_A acts as the ABR/ASBR. In this specific scenario (taken from the Enterprise Firewall Study Guide), one of the paths advertised by FortiGate_A reaches FortiGate_B as an inter-area path while the other is seen as an intra-area path.
* Why only one route?
* By default, rfc-1583-compatible is disabled on FortiGate. Therefore, it follows RFC 2328 logic.
* Because RFC 2328 strictly prefers the intra-area path to the ASBR over the inter-area path, FortiGate_B discards the inter-area path and only installs the intra-area one in its routing table.
* To allow FortiGate_B to use both paths (ECMP) for the external route, the administrator must enable RFC 1583 compatibility using the following CLI command:
config router ospf
set rfc1583-compatible enable
end
* Once enabled, the FortiGate will stop preferring path types and will instead use the cost to determine the best path (or paths), allowing both routes to appear if the costs are equal.
質問 # 156
In which two ways does FortiGate utilize the Internet Service Database (ISDB)?
正解：B、D
解説：
The Internet Service Database (ISDB) is a robust repository maintained by FortiGuard that contains the public IP addresses and port numbers of thousands of popular cloud-based services and applications.
FortiGate utilizes the ISDB in two primary ways:
* Provides predefined IPs and ports: It functions as a dynamic database of known services (like Microsoft 365 or AWS), saving administrators from the impossible task of manually creating and updating hundreds of address objects for these services.
* Blocks (or allows) IPs and ports: These ISDB objects can be used directly as the " Destination " in firewall policies. This allows the FortiGate to effectively block or allow traffic based on the specific IP ranges and ports associated with that internet service, providing granular control over application-level traffic at the network layer.
質問 # 157
Refer to the exhibit, which shows an enterprise network connected to an internet service provider.
An administrator must configure a loopback as a BGP source to connect to the ISP.
Which two commands are required to establish the connection? (Choose two.)
正解：B、C
解説：
When configuring a loopback interface as the BGP source for connecting to an ISP, two important settings must be applied:
1. Enable EBGP Multihop (ebgp-enforce-multihop)
BGP normally expects directly connected neighbors, but since the ISP and FortiGate A are using loopback interfaces, packets will not be sent directly between their physical interfaces. The ebgp- enforce-multihop command allows BGP to form an eBGP peering over multiple hops.
2. Set the Update Source (update-source)
Since FortiGate is using a loopback interface as the source, the update-source command ensures that BGP updates originate from the loopback interface rather than a physical interface.
This is essential because BGP peers must match the source IP with the configured neighbor address.
質問 # 158
Refer to the exhibit, which shows an ADVPN network.
An administrator must configure an ADVPN using IBGP and EBGP to connect overlay network 1 with 2.
What must the administrator configure in the phase 1 VPN IPSEC configuration of the Hub2Hub tunnels?
正解：D
質問 # 159
Refer to the exhibit, which shows the ADVPN network topology and partial BGP configuration.
Which two parameters must an administrator configure in the config neighbor range for spokes shown in the exhibit? (Choose two.)
正解：A、D
解説：
In the given ADVPN (Auto-Discovery VPN) topology, BGP is being used to dynamically establish routes between spokes. The neighbor-range configuration is crucial for simplifying BGP peer setup by automatically assigning neighbors based on their IP range.
set neighbor-group advpn
# The neighbor-group parameter is used to apply pre-defined settings (such as AS number) to dynamically discovered BGP neighbors.
# The advpn neighbor-group is already defined in the configuration, and assigning it to the neighbor-range ensures consistent BGP settings for all spoke neighbors.
set prefix 172.16.1.0 255.255.255.0
# This command allows dynamic BGP peer discovery by defining a range of potential neighbor IPs (172.16.1.1 - 172.16.1.255).
# Since each spoke has a unique /32 IP within this subnet, this ensures that any spoke within the 172.16.1.0
/24 range can automatically establish a BGP session with the hub.
質問 # 160
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