N10-009 Networking Concepts Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  It connects two different VLANs.

  Why it's wrong here

  Connecting two different VLANs, known as inter-VLAN routing, is a function performed by a Layer 3 device such as a router or a Layer 3 switch. While a default gateway is often configured on such a device, its specific role is to provide an exit point for a *single* VLAN's traffic to reach *any* other network, not inherently to facilitate communication *between* distinct internal VLANs. The default gateway defines the path *out* of a subnet, not necessarily the path *between* internal subnets.

  When this WOULD be correct

  In a question asking 'Which device connects two different VLANs?', the correct answer would be a router or Layer 3 switch, which can perform inter-VLAN routing.

• ✗

  It provides DHCP services to the local network.

  Why it's wrong here

  Providing DHCP services involves dynamically assigning IP addresses, subnet masks, default gateways, and DNS server information to network clients. This specific service is handled by a DHCP server, which is a distinct network application or role. While a router, which often acts as a default gateway, can host a DHCP server, the default gateway's fundamental function is packet forwarding, not IP address management.

  When this WOULD be correct

  In a question asking 'Which network service automatically assigns IP addresses to devices on a local network?', the correct answer would be DHCP, making 'It provides DHCP services to the local network' the right choice.

• ✓

  It routes traffic from the local network to external networks.

  Why this is correct

  The default gateway serves as the essential next-hop router for all network traffic originating from the local subnet and destined for any external network. When a device needs to communicate with an IP address outside its immediate local network segment, it forwards those packets to the default gateway. This critical function enables local devices to access the internet, remote corporate networks, or any other network beyond their direct broadcast domain.

• ✗

  It translates private IP addresses to public IP addresses.

  Why it's wrong here

  Translating private IP addresses to public IP addresses, commonly known as Network Address Translation (NAT), is a separate function that modifies packet headers to allow multiple private IPs to share a single public IP address for internet access. While NAT is frequently implemented on the same device that serves as the default gateway (e.g., a border router or firewall), it is not an inherent or defining characteristic of a default gateway's core routing responsibility. A default gateway's primary role is simply to forward traffic to the next hop towards its destination.

  When this WOULD be correct

  In a question asking 'Which device translates private IP addresses to public IP addresses for internet access?', the correct answer would be a router or firewall performing NAT, which could be described as 'It translates private IP addresses to public IP addresses.'

Option-by-option analysis

Why each answer is right or wrong

Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The N10-009 exam frequently reuses these exact scenarios with slightly different constraints.

Analysis generated from the official N10-009blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”

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