New Server Hardening: The First Step

SY0-701 By islever Editorial Last updated

Given a scenario, apply common security techniques to computing resources. Given a scenario, select mitigation techniques or controls to secure an enterprise environment.

Short answer

A For a newly deployed server, close unnecessary service ports first to reduce the attack surface before updating software, adding ACL entries, or upgrading the OS.

Question

Which of the following is the first step to secure a newly deployed server?
  1. Close unnecessary service ports. Correct Answer
  2. Update the current version of the software.
  3. Add the device to the ACL.
  4. Upgrade the OS version.

Key Takeaways

It tests whether you prioritize least functionality and attack surface reduction over patch management as the first hardening action, with the trap being to choose software updates because they sound proactive.

Securing a newly deployed server starts with attack surface reduction: close unnecessary service ports before updating software, adding ACL entries, or upgrading the OS. This page explains why option A is the exam-correct first step.

Common mistake: The most plausible wrong answer is B, updating the current software. Patching is essential, but it comes after removing unnecessary services and ports so you do not expose, maintain, or patch attack surface the server does not need.

Expert Analysis

The boundary being tested. This item sits on the line between two legitimate hardening activities: reducing the attack surface through least functionality and remediating known vulnerabilities through patch management. Both are required for a newly deployed server, so the word “first” is doing the work. The scenario describes a fresh deployment with no stated exposure, no specific outstanding vulnerability and no existing ACL—so the initial action is to remove reachable entry points before spending effort on software that may not need to run.

Why A wins on exam doctrine. Closing unnecessary service ports disables or blocks services the server role does not require. That is the practical expression of least functionality, and it immediately reduces what a scanner or attacker can see. Comments arguing for A frame it as attack-surface reduction: a new server often ships with default services listening, and closing unused ports eliminates those entry points before they can be probed. The key is that A is not merely a network control here; it is host hardening.

Why B, C and D are later or conditional. Option B—updating current software—is important, and some comments reasonably argue that an outdated service behind an open port remains exploitable. But patch management is not the first step when unnecessary services should be removed; there is little point patching software that is about to be disabled. Option C, adding the device to an ACL, controls reachability at a network layer but leaves the host’s listening services intact. Option D, upgrading the OS version, is a platform change, not a default first hardening step, and may be unnecessary or disruptive.

Exam takeaway. For SY0-701, when asked for the first server-hardening step, choose the option that immediately shrinks the host’s attack surface—here A, close unnecessary service ports—then patch, restrict with ACLs and upgrade only as required.

Official Reference

These links open the official vendor documentation in a new tab.

Exam Strategy

When a question asks for the “first” hardening step, look for the action that removes exposure rather than the one that improves an existing component. CompTIA often rewards least functionality—disabling services or closing ports—before patching, ACL placement, or OS upgrades. Separate “must do eventually” from “must do first”: updates, ACLs and upgrades are all valid controls, but they do not shrink the listening attack surface. If the scenario mentions a live, newly deployed host, prioritize the option that immediately removes reachable entry points.

Frequently Asked Questions

Why is closing unnecessary ports the first step instead of patching the server?

Unneeded ports expose services that do not need to be reachable, so disabling them immediately reduces the attack surface. Patching remains essential, but it should follow removal of unnecessary functionality so you do not maintain or expose services the server does not require.

Does adding the server to an ACL secure it before hardening?

No. An ACL controls who can reach the server but does not remove vulnerable or unnecessary services on the host. Host hardening—closing unused ports and disabling unneeded services—must secure the server itself before network access rules are relied on.

Is upgrading the OS version the same as updating current software?

No. Upgrading changes the OS release and can introduce compatibility or support issues; updating current software applies fixes within the deployed version. Neither replaces the initial attack-surface reduction step in this scenario.

More SY0-701 FAQ →

Discussion 14 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 14

  1. 6d565fd 👍 3 Answered A
    Correct Answer: A Explanation Explanation/Reference: The first step in securing a newly deployed server is to close unnecessary service ports. Open ports can expose the server to unauthorized access and potential cyber threats. By closing unused ports, the attack surface is reduced, limiting the number of entry points available to attackers. Updating the software version (B) and upgrading the OS version (D) are important security measures but should follow the step of securing open ports to prevent immediate exposure to threats. Adding the device to the Access Control List (ACL) (C) is a step in network security but does not directly secure the server itself against potential attacks. Closing unnecessary ports helps in minimizing the risk of network-based attacks, such as port scanning and exploitation of default services.
  2. 77bc8e2 👍 3 Answered A
    chat gpt : A. Close unnecessary service ports. Explanation: When securing a newly deployed server, the first step is to reduce the attack surface. That starts with: Closing unnecessary service ports to prevent unauthorized access. Disabling unused services limits potential entry points for attackers. Why not the others first? B. Update the current version of the software – Important, but not as immediate as stopping exposure to the network. C. Add the device to the ACL – That’s part of network policy configuration, but not directly securing the server itself. D. Upgrade the OS version – Upgrades can introduce instability if not tested, and should follow securing the system.
  3. Xenowynn 👍 3 Answered B
    When a server is first deployed, it often comes with outdated software versions that may have known security vulnerabilities. Updating software patches these vulnerabilities before you expose the server to any network traffic. After updating, you proceed with other security measures like closing unnecessary ports (A), adding to access control lists (C), and upgrading the OS (D) if necessary.
  4. 78834d6 👍 3 Answered B
    The most immediate and critical first action is typically to update all installed software, including the operating system and any services or applications, to their latest stable versions and apply all security patches.
  5. 21bc1a0 👍 3 Answered B
    Updating the software ensures you have the latest security patches and fixes for known vulnerabilities, which is crucial for protecting your server from potential attacks right from the start.
Show 9 more comments
  1. Empath 👍 2 Answered B
    A. Close unnecessary service ports. Important, but it comes after ensuring the system is fully patched. Otherwise, even the required services could be vulnerable. B. Update the current version of the software. ✅ This is the first step. Ensures the server starts from a secure baseline (patched OS, updated software, latest security fixes). C. Add the device to the ACL. Access control is important, but it only matters after the system itself is secured and patched. D. Upgrade the OS version. Not always necessary — the server might already be deployed with the correct OS version. If it’s outdated, upgrading is part of updating/patching, but it’s not the general first step. The answer is: B. Update the current version of the software
  2. Tiagonbt 👍 2 Answered D
    Before configuring ports, permissions or network rules, it is essential to ensure that the system is up to date, including with the latest version of the operating system, which corrects known vulnerabilities.
  3. trac0420 👍 1 Answered A
    • Attack Surface Reduction: When a new server is deployed, it often comes with pre-configured default services running out of the box. Closing unnecessary ports immediately closes potential entry points, dramatically minimizing the risk of network-based probing, port scanning, or the immediate exploitation of default protocols before any other modifications take place. B & D. Update software / Upgrade OS version: While patching and updating the operating system and applications are highly critical steps in server hardening, disabling exposed network endpoints (ports) should happen as a direct priority to ensure the machine isn't immediately targeted or compromised over the network while the updates are being downloaded and processed.
  4. marluk 👍 1 Answered D
    1. Install or upgrade current OS 2.immediately install patches, upgrade drivers 3. close unnecessary ports, disable unnecessary demons,services - hardening - minimize surface attacks 4. Configure firewall rules , configure vlan if necessary, enable host-base firewall 5. Configure centrall authorization (AD, LDAP, Radius), disable local account, enable MFA and password polices 6. Hardening system (enable logging and audit), SELinux/AppArmor(Linux), change default security settings, least priviliges 7. Install and configure application with least priviliges 8. Test security: vulnerability scan, verify configuration 9. Documentation: document configuration, enable monitoring (SIEM, syslog, alerts), establish update and backup procedures
  5. Xenowynn 👍 1
    When the server is first deployed, the software and services might be outdated and vulnerable. Even if you close some ports, if the services running behind the open ports have known security flaws, an attacker could exploit those vulnerabilities. Some ports might be necessary during the update process, especially if you need to connect to package repositories or update servers remotely. You want to make sure your server is patched against known exploits before you start locking things down. Otherwise, you might close some ports, but the server is still vulnerable through services that are accessible or via vulnerabilities in allowed services.
  6. BigCGeekn 👍 1 Answered A
    The correct first step to secure a newly deployed server among standard options is to close unnecessary service ports. Here is how the common exam options break down: • c. Close unnecessary service ports: Correct. This is the foundational action of server hardening. By shutting down unused ports and services immediately after deployment, you minimize the server's attack surface and eliminate immediate entry points for threat actors
  7. squishy_fishy 👍 1 Answered A
    GPT: The first step in securing a newly deployed server is to minimize its attack surface—and that starts with closing unnecessary service ports. Open ports expose services that could be exploited by attackers. By disabling unused services and ports: You reduce entry points for attacks. You limit exposure to only essential services.
  8. 5a11b63 👍 1 Answered A
    While all options are important for securing a server, the first immediate step should be to reduce the attack surface by disabling or closing any service ports that are not required for the server’s function. This minimizes exposure to potential threats even before applying updates or configuring access controls.
  9. tailogdavid1987 👍 1
    A newly deployed server is still running default services. Close the ports you do not need before it faces the network. Updating software and the OS matter, but the first hardening step is reducing what is exposed.

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