Port 110 is used by POP3, a protocol designed for downloading emails from a remote server to a local client.
POP3 does not inherently synchronize changes (such as read status, folder organization, or deletions) between devices. The customer wants a more secure connection that automatically synchronizes with the server, which directly aligns with the functions of IMAP (Internet Message Access Protocol).
IMAP typically uses port 143 for unencrypted connections and 993 for secure, encrypted connections (IMAPS). It is designed for modern email usage-supporting multi-device access, live synchronization across clients, and server-stored mail. When a user reads, deletes, or moves an email using IMAP, these changes are reflected on the server and visible on every device logged into the same account.
CompTIA A+ emphasizes that IMAP is preferred for users requiring constant synchronization, mobile access, and cloud-based email management, while POP3 is considered outdated. IMAP also supports secure, encrypted communication when paired with SSL/TLS.
HTTPS and SFTP do not handle email retrieval, and SMTP is a sending protocol, not a retrieval protocol.
Therefore, IMAP is the only correct and CompTIA-aligned upgrade option.

The baseline documentation says the valid network range ends at 192.168.232.255, but the user's gateway is
192.168.233.1, which is outside the permitted network range. CompTIA A+ emphasizes that devices must have a gateway inside their own subnet.
Given a mask of 255.255.255.0, the user's subnet is 192.168.223.x, so the gateway must be in 192.168.223.x, not 192.168.233.x.
DNS settings are public and acceptable. The IP address and subnet mask are valid within the documented address space.
Therefore, the incorrect setting is the gateway, which prevents external routing. Correcting it resolves the connection issue, matching CompTIA's routing and TCP/IP troubleshooting procedures.

PCIe (Peripheral Component Interconnect Express) is required for high-end video cards.
NVMe (Non-Volatile Memory Express) utilizes the M.2 or PCIe interface for the fastest SSD performance.
From CompTIA A+ 220-1101 Official Study Guide, Objective 3.2 - Motherboard expansion slots and storage interfaces:
"High-end video cards require a PCIe slot, while NVMe drives use M.2 (PCIe) slots for the highest data transfer rates." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 3: Motherboard and Storage CompTIA Exam Objectives 220-1101, Domain 3.2

Fiber optic connections provide the highest data transfer rates and symmetrical upload and download speeds.
This makes fiber the ideal choice for applications requiring high-speed connectivity, such as video conferencing, large file transfers, and cloud-based workflows.
Reference: CompTIA A+ Certification Exam Core 1 Objectives - Domain 2.0 Networking - Objective 2.7:
Compare and contrast internet connection types, network types, and their features.

CompTIA A+ highlights that swollen or expanding batteries especially lithium-ion batteries can physically warp the laptop chassis, keyboard, or trackpad. This happens when internal chemical reactions cause the battery to swell. Distorted keyboards, bulging trackpads, and lifted chassis panels are classic symptoms of battery failure.
RAM and HDD issues do not cause physical deformation. A broken keyboard may malfunction electronically, but it will not bulge upward unless forced by something underneath typically an expanding battery.
The A+ safety domain also warns technicians not to puncture swollen batteries and to replace them immediately due to fire hazards.
Therefore, a failing (swollen) laptop battery is the most likely cause.