AZ-104 Implement and Manage Virtual Networking Practice Test 4 — 15 Questions

Question 1

Why is centralized logging especially helpful during incident investigation?

Accepted Answer

It helps investigators analyze related events from multiple devices in one place.. Centralized logging aggregates logs from multiple sources (servers, firewalls, applications) into a single repository, enabling investigators to correlate events across devices during an incident. This eliminates the need to manually access each device's local logs, speeding up root cause analysis and providing a unified timeline of activities.

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It guarantees that no attack can ever succeed.

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It replaces the need for access control.

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It forces all devices to use the same VLAN.

Question 2

Why is centralized logging especially useful during security investigations?

Accepted Answer

It makes related events from multiple devices easier to review and correlate.. Centralized logging aggregates logs from multiple sources (e.g., firewalls, servers, Azure Network Watcher) into a single repository, such as Azure Log Analytics. During security investigations, this enables security analysts to correlate events across devices (e.g., matching a suspicious IP address in firewall logs with authentication failures in domain controller logs) without manually connecting to each device. This correlation is critical for reconstructing attack timelines and identifying lateral movement, which is impossible with siloed logs.

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It guarantees that attacks cannot succeed.

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It replaces the need for authentication and authorization.

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It forces all devices to use the same VLAN.

Question 3

Why is centralized logging valuable during security incident response?

Accepted Answer

It makes related events from many devices easier to collect and correlate.. Centralized logging aggregates logs from multiple sources (e.g., Azure VMs, network security groups, Azure Firewall) into a single repository like Azure Log Analytics or Azure Sentinel. This correlation enables security analysts to identify patterns across devices, such as a chain of events from an initial breach to lateral movement, which is critical for incident response. Without centralization, manually correlating timestamps and log formats from disparate systems would be impractical during an active attack.

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It guarantees that attacks cannot succeed.

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It replaces access control mechanisms.

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It forces all systems to use one VLAN.

Question 4

An operations team wants device-generated log messages collected centrally so engineers can review interface changes, warnings, and errors from one place. Which technology is most directly associated with that goal?

Accepted Answer

Syslog. Syslog (A) is the standard protocol for collecting and centralizing log messages from network devices, servers, and other infrastructure. It allows engineers to forward interface changes, warnings, and errors to a central syslog server, enabling unified review and alerting. This directly matches the goal of centralized device-generated log collection.

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NetFlow

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DHCP relay

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Port security

Question 5

Which two statements accurately describe the value of centralized DHCP in enterprise networks?

Accepted Answer

It can reduce the need to maintain separate DHCP servers in every subnet or site.. Centralized DHCP can simplify operations by keeping address assignment services in a more controlled central location rather than distributing separate servers everywhere. In practical terms, this can reduce administration overhead and make policy changes easier. The tradeoff is that Layer 3 boundaries must then be handled properly so client requests can still reach the server.

This is why DHCP relay becomes important in many campus and branch designs.

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It removes the need for relay across Layer 3 boundaries.

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It eliminates the need for default gateways.

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It is useful only on wireless networks.

Question 6

A network team centralizes DHCP in a data center. Users in a remote branch stop receiving addresses after the branch router is replaced. Which missing configuration on the branch gateway is the strongest suspect?

Accepted Answer

DHCP relay or helper configuration on the client-facing gateway interface. When a DHCP server is centralized in a data center, remote clients rely on the branch gateway to forward their broadcast DHCP requests as unicast to the server. This is achieved by configuring a DHCP relay agent (ip helper-address) on the client-facing interface of the branch router. Without this configuration, DHCP broadcasts are dropped at the router, and clients never receive IP addresses.

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A spanning-tree priority change on the branch switch

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A CAPWAP tunnel from the branch PCs to the data center

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A voice VLAN configuration on the WAN interface

Question 7

A network engineer wants device logs from routers and switches sent to a central server for long-term retention and analysis. Which service should be configured?

Accepted Answer

Syslog. Syslog is the standard protocol for sending device logs (e.g., from routers and switches) to a central server for long-term retention and analysis. It operates over UDP port 514 (or TCP 6514 for reliable delivery) and allows network devices to forward event messages to a syslog collector, which can store, filter, and analyze them. This directly meets the requirement for centralized logging and analysis.

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NTP

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DNS

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NetFlow

Question 8

You deploy a private endpoint for an Azure Storage account. Virtual machines in VNet-App must resolve the storage account name to the private IP address of the endpoint instead of the public endpoint. What should you configure?

Accepted Answer

A private DNS zone linked to VNet-App.. A private endpoint requires DNS resolution to map the storage account's fully qualified domain name (FQDN) to its private IP address. By creating a private DNS zone (privatelink.blob.core.windows.net) and linking it to VNet-App, Azure automatically creates an A-record pointing to the private endpoint's IP, ensuring VMs resolve the storage account name privately instead of via the public endpoint.

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A network security group on the subnet.

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A public DNS zone for the storage account name.

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A user-defined route table on the subnet.

Question 9

VM-Web01 is connected to Subnet-Web in VNet-Prod. Users on the internet cannot access the website hosted on TCP port 443. You confirm that VM-Web01 has a public IP address and the web service is running. You need to allow inbound HTTPS traffic with the least administrative effort. What should you do?

Accepted Answer

Add an inbound NSG rule allowing TCP 443.. The VM has a public IP and the web service is running, but internet users cannot access it. The most common reason is that the Network Security Group (NSG) associated with the subnet or NIC is blocking inbound traffic. Adding an inbound NSG rule to allow TCP 443 is the least administrative effort to permit HTTPS traffic from the internet.

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Create a user-defined route to the internet.

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Configure VNet peering with another virtual network.

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Create a private endpoint for VM-Web01.

Question 10

A subnet contains several application servers. You need to allow inbound TCP 3389 only from a management subnet named Subnet-Mgmt and deny RDP from all other sources. What should you do?

Accepted Answer

Create an NSG rule allowing TCP 3389 from the Subnet-Mgmt address range and rely on the default deny afterward.. Network Security Groups (NSGs) in Azure filter traffic based on rules that are evaluated in priority order. By creating an inbound rule that allows TCP 3389 (RDP) from the Subnet-Mgmt address range, and relying on the default implicit deny rule that blocks all other inbound traffic, you effectively restrict RDP access to only the management subnet. No additional configuration is needed to deny traffic from other sources, as the default deny handles that automatically.

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Create a route table that sends RDP traffic to the management subnet.

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Deploy a private endpoint for each application server.

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Enable service endpoints on the application subnet.

Question 11

Two virtual machines named VM-Web01 and VM-Web02 host the same public web application. Users on the internet must connect through a single public IP address, and incoming requests should be distributed across both VMs. What should you deploy?

Accepted Answer

A public load balancer. A public load balancer (Azure Load Balancer with a public frontend IP) is required because it provides a single public IP address for internet clients and distributes incoming traffic across the backend VMs (VM-Web01 and VM-Web02) using a configured load-balancing rule. This ensures high availability and scalability for the web application.

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An internal load balancer

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A private DNS zone

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A Recovery Services vault

Question 12

Your company deploys a network virtual appliance (NVA) in a hub subnet. All outbound internet traffic from Subnet-App in a spoke VNet must pass through the NVA for inspection. What should you configure on Subnet-App?

Accepted Answer

A user-defined route with a next hop of Virtual Appliance. A user-defined route (UDR) with a next hop of Virtual Appliance forces all outbound traffic from Subnet-App to be forwarded to the NVA for inspection. This overrides Azure's default system route for 0.0.0.0/0, which normally sends internet-bound traffic directly to the internet. By specifying the NVA's private IP as the next hop, you ensure traffic is routed through the hub subnet for inspection before leaving the network.

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A private DNS zone

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A service endpoint for Microsoft.Storage

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A NAT gateway on the NVA subnet only

Question 13

You have two virtual networks named VNet-Hub and VNet-Spoke1 in the same Azure region. Resources in the two VNets must communicate privately over the Microsoft backbone without using a VPN gateway. What should you configure?

Accepted Answer

VNet peering. VNet peering enables direct, private connectivity between two virtual networks in the same Azure region using the Microsoft backbone infrastructure. It does not require a VPN gateway, public IP addresses, or any internet transit, making it the correct choice for private communication between VNet-Hub and VNet-Spoke1.

Answer

A site-to-site VPN

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A public load balancer

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An NSG outbound deny rule

Question 14

Traffic from Subnet-App to the internet is being routed through a virtual appliance unexpectedly. You need to identify which route is being applied to the network interface of VM-App01. Which Azure feature should you use?

Accepted Answer

Effective routes for the network interface. Effective routes for the network interface (NIC) shows the actual routes applied to a specific VM's NIC after evaluating all route tables, virtual network gateway routes, and BGP routes. Since traffic from Subnet-App to the internet is unexpectedly going through a virtual appliance, you need to see which route (e.g., a user-defined route with next hop type VirtualAppliance or VirtualNetworkGateway) is being selected based on the longest prefix match. This tool directly displays the effective next hop for each destination prefix, allowing you to identify the misconfigured route causing the traffic to be redirected.

Answer

NSG flow logs

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Azure Policy compliance

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The subscription activity log

Question 15

You have two virtual networks in the same Azure region named VNet-App and VNet-DB. Resources in the two networks must communicate privately over the Azure backbone without using VPN gateways. What should you configure?

Accepted Answer

Virtual network peering. Virtual network peering connects two Azure virtual networks in the same region via the Microsoft backbone infrastructure, enabling private IP communication without a VPN gateway or public internet. This is the correct solution because it meets the requirement for private, low-latency connectivity between VNet-App and VNet-DB using Azure's high-speed backbone.

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A site-to-site VPN

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A network security group

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An Azure Firewall policy only