Author: Anonymous

On Monday morning, ten newly arrived contractors cannot access intranet file shares or the Internet. Running ipconfig /all on Contractor-PC-01 reveals IPv4 Address: 169.254.14.88, Subnet Mask: 255.255.0.0, Default Gateway: [Blank]. Permanent staff at adjacent desks retain valid 192.168.40.x leases and have normal connectivity. Which TWO statements describe the root cause of this failure and the underlying protocol behavior? (Select TWO)

A technician replaces obsolete hardware in an industrial facility. The existing device receives incoming electrical signals on one port and regenerates the waveform out every other connected port without reading MAC addresses or packet headers. Which device is being replaced?

An engineer connects Switch A to Switch B using four separate 1Gbps copper Ethernet cables to form a redundant high-bandwidth backbone link. Immediately after plugging in all four cables without configuring switch software, network performance collapses: CPU utilization reaches 100% on both switches, port activity LEDs flash continuously in unison, and workstations disconnect. Which TWO statements describe why this outage occurred and what configuration must be implemented? (Select TWO)

⚡ CompTIA Network+ PBQ 5: Firewall Access Control List (ACL) Hardening You must harden an enterprise perimeter firewall protecting three security zones: Outside (Internet), DMZ (192.168.50.0/24), and Internal LAN (10.10.0.0/16). Security policy mandates: 1. Permit inbound Internet traffic to access the DMZ Web Server (192.168.50.10) exclusively over encrypted HTTPS. 2. Permit the internal IT Admin subnet (10.10.100.0/24) to manage DMZ appliances exclusively over encrypted SSH. 3. Explicitly deny and log legacy unencrypted cleartext protocols (Telnet and HTTP) from all sources. 4. Enforce the principle of least privilege with a default termination rule. Configure the Access Control List (ACL) rules: Rule 10 (Public Web Traffic): – Action: [pbq5_r1_act] – Destination IP: [pbq5_r1_dst] – Destination Port: [pbq5_r1_port] Rule 20 (Secure IT Administration): – Action: [pbq5_r2_act] – Destination IP: [pbq5_r2_dst] – Destination Port: [pbq5_r2_port] Rule 30 (Block Legacy Cleartext Traffic): – Action: [pbq5_r3_act] – Blocked Destination Ports: [pbq5_r3_port] – Intent Description: [pbq5_r3_desc] Rule 999 (Default Posture): – Action: [pbq5_r4_act] – Source: [pbq5_r4_src] – Destination: [pbq5_r4_dst]

An enterprise campus requires a high-speed backbone linking a data center core switch to a disaster recovery facility located 18 kilometers (11.2 miles) away. The design mandates 10 Gbps Ethernet throughput with minimal attenuation and modal dispersion across the run. Which cabling and transceiver combination is BEST suited?

An administrator deploys an iSCSI SAN connected across a 10Gbps top-of-rack leaf-spine fabric to VMware ESXi hosts. Workstations access virtual machines normally, but storage vMotion migrations fail or crawl under 10 Mbps. A packet capture on the storage interface reveals 9000-byte TCP packets dropped at intermediate switches with ICMP ‘Fragmentation Needed and DF set’. Which TWO actions must the administrator take to resolve this issue and support end-to-end Jumbo Frames? (Select TWO)

An unmanaged 24-port Gigabit Ethernet switch is installed in a lab. Twelve PCs and two network printers connect directly to switch ports 1 through 14. Port 24 connects to an enterprise edge router. No VLANs are configured. How many collision domains and broadcast domains exist on this switch?

An enterprise router interface is assigned the uncompressed 128-bit IPv6 address: 2001:0db8:0000:0000:00ab:0000:0000:0001. Which option represents the correctly compressed format according to RFC 5952?

A security analyst reviews internal firewall logs. The network uses RFC 1918 private IPv4 addressing internally with NAT for Internet access. Which destination IP address observed in outbound traffic logs represents a publicly routable Internet address?

An enterprise designs a warehouse wireless network for hundreds of automated barcode scanners and IoT nodes. Requirements specify operating simultaneously on 2.4 GHz and 5 GHz, using OFDMA to service multiple low-power clients concurrently, and improving battery life via Target Wake Time (TWT). Which IEEE Wi-Fi standard satisfies all requirements?