LATEST CCNA (CISCO CERTIFIED
NETWORK ASSOCIATE) EXAM BANK |
COMPLETE EXAM BANK WITH CORRECT
ANSWERS AND RATIONALES. A+ GRADED
1. A network engineer needs to connect two switches
that are 150 meters apart. Which cable type is most
appropriate?
A) Cat6 UTP (max 100 meters)
B) Single-mode fiber (SMF) with SFP+ transceivers
C) Cat5e UTP
D) Coaxial cable
Correct answer: B
Rationale: UTP is limited to 100 meters. Single-mode
fiber supports distances up to 10+ km. Multimode
fiber supports up to 550m at 1Gbps.
2. Which of the following is the default administrative
distance for OSPF (Open Shortest Path First) in a
Cisco router?
A) 1
B) 90
,C) 110
D) 120
Correct answer: C
Rationale: Default administrative distances: Directly
connected 0, Static 1, EIGRP 90, OSPF 110, RIP 120.
Lower AD = more preferred.
3. A switch receives a frame with a destination MAC
address that is not in its MAC address table. What
does the switch do?
A) Drops the frame
B) Sends an ARP request
C) Floods the frame out all ports (except the port on
which it was received) in the same VLAN
D) Sends a NACK back to the source
Correct answer: C
Rationale: Switches flood unknown unicast frames
(unknown destination MAC) to all ports in the same
VLAN except the ingress port.
4. Which of the following IEEE standards defines
Ethernet over twisted pair for 1000BASE-T (Gigabit
Ethernet)?
,A) 802.11
B) 802.3ab
C) 802.3z
D) 802.1Q
Correct answer: B
Rationale: 802.3ab defines Gigabit Ethernet over
Cat5e/Cat6 UTP (1000BASE-T). 802.3z defines
Gigabit over fiber (1000BASE-SX/LX).
5. A router receives a packet with a TTL (Time To
Live) value of 1. What does the router do with the
packet?
A) Forwards it to the next hop
B) Drops the packet and sends an ICMP Time
Exceeded message back to the sender
C) Processes the packet normally
D) Broadcasts the packet to all interfaces
Correct answer: B
Rationale: TTL is decremented at each hop. When
TTL reaches 0, the router discards the packet and
sends ICMP Type 11 (Time Exceeded) back.
6. Which of the following is a valid MAC address?
, A) 192.168.1.1
B) 00:1A:2B:3C:4D:5E
C) ::1
D) 255.255.255.0
Correct answer: B
Rationale: MAC addresses are 48-bit hexadecimal,
usually written as six pairs separated by colons or
hyphens (e.g., 00:1A:2B:3C:4D:5E).
7. A network administrator configures a router
interface with the IP address 192.168.1.1/30. What is
the subnet mask in dotted decimal?
A) 255.255.255.0
B) 255.255.255.240
C) 255.255.255.252
D) 255.255.255.128
Correct answer: C
Rationale: /30 = 255.255.255.252. This subnet
provides 2 usable host addresses (point-to-point
links).
8. Which of the following is a Class B private IP
address range per RFC 1918?
NETWORK ASSOCIATE) EXAM BANK |
COMPLETE EXAM BANK WITH CORRECT
ANSWERS AND RATIONALES. A+ GRADED
1. A network engineer needs to connect two switches
that are 150 meters apart. Which cable type is most
appropriate?
A) Cat6 UTP (max 100 meters)
B) Single-mode fiber (SMF) with SFP+ transceivers
C) Cat5e UTP
D) Coaxial cable
Correct answer: B
Rationale: UTP is limited to 100 meters. Single-mode
fiber supports distances up to 10+ km. Multimode
fiber supports up to 550m at 1Gbps.
2. Which of the following is the default administrative
distance for OSPF (Open Shortest Path First) in a
Cisco router?
A) 1
B) 90
,C) 110
D) 120
Correct answer: C
Rationale: Default administrative distances: Directly
connected 0, Static 1, EIGRP 90, OSPF 110, RIP 120.
Lower AD = more preferred.
3. A switch receives a frame with a destination MAC
address that is not in its MAC address table. What
does the switch do?
A) Drops the frame
B) Sends an ARP request
C) Floods the frame out all ports (except the port on
which it was received) in the same VLAN
D) Sends a NACK back to the source
Correct answer: C
Rationale: Switches flood unknown unicast frames
(unknown destination MAC) to all ports in the same
VLAN except the ingress port.
4. Which of the following IEEE standards defines
Ethernet over twisted pair for 1000BASE-T (Gigabit
Ethernet)?
,A) 802.11
B) 802.3ab
C) 802.3z
D) 802.1Q
Correct answer: B
Rationale: 802.3ab defines Gigabit Ethernet over
Cat5e/Cat6 UTP (1000BASE-T). 802.3z defines
Gigabit over fiber (1000BASE-SX/LX).
5. A router receives a packet with a TTL (Time To
Live) value of 1. What does the router do with the
packet?
A) Forwards it to the next hop
B) Drops the packet and sends an ICMP Time
Exceeded message back to the sender
C) Processes the packet normally
D) Broadcasts the packet to all interfaces
Correct answer: B
Rationale: TTL is decremented at each hop. When
TTL reaches 0, the router discards the packet and
sends ICMP Type 11 (Time Exceeded) back.
6. Which of the following is a valid MAC address?
, A) 192.168.1.1
B) 00:1A:2B:3C:4D:5E
C) ::1
D) 255.255.255.0
Correct answer: B
Rationale: MAC addresses are 48-bit hexadecimal,
usually written as six pairs separated by colons or
hyphens (e.g., 00:1A:2B:3C:4D:5E).
7. A network administrator configures a router
interface with the IP address 192.168.1.1/30. What is
the subnet mask in dotted decimal?
A) 255.255.255.0
B) 255.255.255.240
C) 255.255.255.252
D) 255.255.255.128
Correct answer: C
Rationale: /30 = 255.255.255.252. This subnet
provides 2 usable host addresses (point-to-point
links).
8. Which of the following is a Class B private IP
address range per RFC 1918?
