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Cisco 300-820 Exam - Topic 27 Question 101 Discussion

Cisco Expressways are being deployed for Mobile and Remote Access. The Expressway-E internal interface (LAN1) IP is 192.168.100.10/24, and the external interface (LAN2) IP is 172.16.100.10/24.The Expressway-C IP is 192.168.20.10/24. The default gateway for each subnet is the first useable address. How must the Expressway-E be configured to allow proper routing to the internal and external networks?
D) IPv4 gateway: 172.16.100.1, and a static route for the 192.168.20.0/24 subnet using LAN1
A) IPv4 gateway: 172.16.100.1, and a static route for the 192.168.100.0/24 subnet using LAN1
B) IPv4 gateway: 192.168.100.1, and a static route for the 192.168.20.0/24 subnet using LAN1
C) IPv4 gateway: 192.168.100.1, and a static route for the 172.16.100.0/24 subnet using LAN2

Cisco 300-820 Exam - Topic 27 Question 101 Discussion

Actual exam question for Cisco's 300-820 exam
Question #: 101
Topic #: 27
[All 300-820 Questions]

Cisco Expressways are being deployed for Mobile and Remote Access. The Expressway-E internal interface (LAN1) IP is 192.168.100.10/24, and the external interface (LAN2) IP is 172.16.100.10/24.

The Expressway-C IP is 192.168.20.10/24. The default gateway for each subnet is the first useable address. How must the Expressway-E be configured to allow proper routing to the internal and external networks?

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Suggested Answer: D

by Bea at Jul 30, 2025, 10:40 PM

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Ashleigh
8 months ago
I can't believe the gateway is 172.16.100.1! Is that correct?
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Nakita
9 months ago
I think option A is the right choice!
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Gene
9 months ago
The Expressway-E internal IP is 192.168.100.10/24.
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Quiana
9 months ago
Wait, why would we use 172.16.100.1 as a gateway?
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Mollie
9 months ago
Definitely not B, that doesn't make sense.
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Shad
9 months ago
I’m leaning towards option D, but I’m not entirely confident. I remember something about needing to configure routes for both internal and external networks, and I hope I’m recalling that correctly.
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Louvenia
10 months ago
I’m a bit confused about the external interface. Shouldn't the gateway for LAN2 be 172.16.100.1? I think that might be important for routing to the external network.
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Halina
10 months ago
I remember practicing a similar question where we had to set up routing for different subnets. I feel like the static route should point to the 192.168.20.0/24 subnet since that's where the Expressway-C is.
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Lenna
10 months ago
I think the Expressway-E needs to have its gateway set to the first usable address in its subnet, which should be 192.168.100.1, but I'm not completely sure about the static routes.
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Merlyn
10 months ago
I'm not too confident about this one. There are a lot of details to consider, and I don't want to just guess. I'll need to carefully review the information provided and think through the routing requirements.
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Tess
11 months ago
I think I've got this! The answer is C - configure the Expressway-E with a gateway of 192.168.100.1 and a static route for the 172.16.100.0/24 subnet using the LAN2 interface.
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Annice
11 months ago
Okay, let's break this down step-by-step. The key is configuring the Expressway-E's gateways and static routes to properly route traffic between the internal and external networks.
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Lizette
11 months ago
Hmm, I'm a bit confused by the different subnets and interfaces. I'll need to review my notes on Expressway routing to make sure I understand this properly.
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Rene
11 months ago
This looks like a tricky routing question. I'll need to carefully analyze the network topology and IP addressing to determine the correct configuration.
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Julio
11 months ago
I think Twana's onto something. Why make it more complicated than it needs to be? As long as the gateways are configured correctly, the routing should just work.
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Claudio
11 months ago
But why do you think that?
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Yuki
12 months ago
I disagree, I believe the correct answer is C)
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Twana
1 year ago
Hmm, I'm not so sure. Wouldn't it be simpler to just use the same gateway for both interfaces? That way, you don't need any static routes.
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Floyd
11 months ago
User 1: I think option B is the correct one.
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Claudio
1 year ago
I think the answer is A)
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Ty
1 year ago
I agree with Kanisha. The gateway for the external interface should be the first usable address in the 172.16.100.0/24 subnet, and a static route is needed for the internal 192.168.100.0/24 subnet.
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Kanisha
1 year ago
Option A looks good to me. The Expressway-E needs to route to the internal network via the LAN1 interface, and to the external network via the LAN2 interface.
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Jose
11 months ago
User1: I think option A is the correct choice.
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