CompTIA Network+ Network+ Network Implementation 3 — Questions and Answers
Question 1: Which cable standard supports 10 Gbps over distances up to 55 meters using existing Cat6 cabling?
- 10GBASE-T on Cat5e
- 10GBASE-T on Cat6 (Correct answer)
- 10GBASE-T on Cat6a
- 10GBASE-SR on Cat6
Correct answer: 10GBASE-T on Cat6
10GBASE-T can run on Cat6 but is limited to 55 meters due to alien crosstalk; Cat6a extends this to 100 meters.
Question 2: An administrator configures a switch port with 'switchport mode trunk'. What is the default native VLAN on most Cisco-compatible switches?
- VLAN 0
- VLAN 1 (Correct answer)
- VLAN 99
- VLAN 1000
Correct answer: VLAN 1
VLAN 1 is the default native VLAN on 802.1Q trunk links; frames on the native VLAN are transmitted untagged.
Question 3: Which routing protocol uses bandwidth and delay as its default composite metric?
- RIP
- OSPF
- EIGRP (Correct answer)
- BGP
Correct answer: EIGRP
EIGRP uses a composite metric calculated from bandwidth and delay by default, though load, reliability, and MTU can also be included.
Question 4: A wireless client is experiencing slow speeds despite having good signal strength. Which issue is most likely?
- Incorrect SSID
- Channel overlap with neighboring APs (Correct answer)
- Wrong encryption type
- Insufficient transmit power
Correct answer: Channel overlap with neighboring APs
Co-channel and adjacent-channel interference from overlapping APs degrade throughput even when signal strength (RSSI) is adequate.
Question 5: Which technology allows a single internet IP address to be shared among multiple internal hosts by tracking connection state?
- PAT (Port Address Translation) (Correct answer)
- Static NAT
- ARP proxy
- SNAT
Correct answer: PAT (Port Address Translation)
PAT (also called NAT overload) maps many private IP:port combinations to a single public IP using unique source port numbers to track sessions.
Question 6: A network administrator wants to ensure that only the first MAC address learned on a switch port is allowed. What feature should be configured?
- BPDU guard
- 802.1X
- Port security with sticky MAC (Correct answer)
- DHCP snooping
Correct answer: Port security with sticky MAC
Port security with sticky MAC learning locks the port to the first MAC address it learns and can disable the port if a different device connects.
Question 7: Which PoE standard delivers up to 30W per port and is defined by IEEE 802.3at?
- PoE (802.3af)
- PoE+ (802.3at) (Correct answer)
- PoE++ (802.3bt)
- UPoE
Correct answer: PoE+ (802.3at)
IEEE 802.3at (PoE+) delivers up to 30W per port, while 802.3af delivers up to 15.4W and 802.3bt delivers up to 90W.
CompTIA Network+ Network+ Network Implementation 3
Which cable standard supports 10 Gbps over distances up to 55 meters using existing Cat6 cabling?