CCNA 1 INTRODUCTION TO
NETWORKS FINAL EXAM
(2026/2027) | 200 VERIFIED Q&A
WITH RATIONALES | CISCO
NETWORKING ACADEMY | PDF
DOWNLOAD A+ GUARANTEED
CCNA 1 Final Exam (Introduction to Networks) – Study Guide
& Practice Questions
A+ Certified Success | 200 High-Yield Practice Questions with
Detailed Rationales (2026/2027)
1. A network administrator is configuring a new Cisco switch for the first
time and needs to establish a secure management connection. The
administrator wants to ensure that all remote management traffic is
encrypted to prevent eavesdropping on sensitive configuration
commands. Which protocol should the administrator configure on the
switch to meet this security requirement while maintaining compatibility
with standard terminal emulation software?
A. Telnet, because it is universally supported and requires minimal
configuration overhead
B. SSH (Secure Shell), because it provides encrypted remote
access using strong authentication and data integrity
verification
C. HTTP, because it allows web-based management through any
standard browser
D. SSH (Secure Shell), because it provides encrypted remote
access using strong authentication and data integrity
verification
E. SNMPv2c, because it supports community-based authentication for
network management
Rationale: B is correct because SSH encrypts all session data
including usernames, passwords, and configuration commands,
protecting against man-in-the-middle attacks and packet sniffing.
Telnet (A) transmits data in plaintext, making it insecure for
,management traffic. HTTP (C) is unencrypted; HTTPS would be
required for web management security. SNMPv2c (E) uses plaintext
community strings and is not designed for interactive management
sessions.
2. A technician is troubleshooting a connectivity issue between two
directly connected routers. The interface status shows "up/up" on both
routers, but ping attempts between the directly connected interfaces fail.
The technician verifies that IP addresses are configured correctly and
belong to the same subnet. Which Layer 2 issue should the technician
investigate next to resolve this connectivity problem?
A. Mismatched subnet masks preventing proper network identification
B. Encapsulation mismatch, where one router interface uses
HDLC and the other uses PPP, causing frame rejection
C. Incorrect default gateway configuration preventing inter-network
communication
D. Encapsulation mismatch, where one router interface uses
HDLC and the other uses PPP, causing frame rejection
E. ACL blocking ICMP echo requests on one of the router interfaces
Rationale: B is correct because serial interfaces require matching
encapsulation protocols (HDLC is Cisco default; PPP is standards-
based) to successfully exchange frames. Even with Layer 3 connectivity
configured properly, mismatched Layer 2 encapsulation causes frames
to be discarded. Subnet masks (A) and default gateways (C) are Layer 3
concerns already verified. ACLs (E) could block traffic but
encapsulation mismatch is a more fundamental Layer 2 issue to check
first.
3. A network engineer is designing an IPv4 addressing scheme for a new
branch office that requires support for 500 host devices on a single
subnet while minimizing wasted address space. Which subnet mask
provides the most efficient allocation that meets the host requirement?
A. 255.255.255.0 (/24) providing 254 usable host addresses
B. 255.255.254.0 (/23) providing 510 usable host addresses
C. 255.255.252.0 (/22) providing 1,022 usable host addresses
D. 255.255.254.0 (/23) providing 510 usable host addresses
E. 255.255.248.0 (/21) providing 2,046 usable host addresses
,Rationale: B is correct because a /23 subnet (255.255.254.0) provides
2^9 - 2 = 510 usable host addresses, which accommodates 500 hosts
with minimal waste. A /24 (A) only provides 254 hosts, insufficient for
the requirement. A /22 (C) and /21 (E) provide adequate addresses but
waste significant address space, violating efficient allocation principles.
The "-2" accounts for network and broadcast addresses.
4. During a network audit, a security analyst discovers that several
workstations are configured with APIPA addresses in the 169.254.0.0/16
range. What does this addressing configuration indicate about the
network connectivity status of these devices?
A. The devices are successfully obtaining addresses from a DHCP server
on a different subnet
B. The devices failed to obtain an IP address from a DHCP
server and self-assigned a link-local address
C. The devices are configured with static addresses for a private
management network
D. The devices failed to obtain an IP address from a DHCP
server and self-assigned a link-local address
E. The devices are participating in a zero-configuration networking
protocol for service discovery
Rationale: B is correct because APIPA (Automatic Private IP
Addressing) assigns addresses in 169.254.0.0/16 when a DHCP client
cannot contact a DHCP server after multiple attempts. This indicates
DHCP server unavailability, network connectivity issues, or DHCP
scope exhaustion. Option A is incorrect because DHCP-assigned
addresses would not be in the APIPA range. Option C describes manual
static configuration, not automatic assignment. Option E describes
protocols like mDNS, not APIPA behavior.
5. A network administrator needs to verify the Layer 2 address of a
directly connected device to troubleshoot an ARP-related connectivity
issue. Which command should the administrator use on a Cisco router to
display the IP-to-MAC address mappings currently stored in the ARP
cache?
A. show ip route
B. show mac address-table
C. show ip arp
, D. show ip arp
E. show cdp neighbors detail
Rationale: C is correct because "show ip arp" displays the Address
Resolution Protocol cache containing IP address to MAC address
mappings learned on router interfaces. "show ip route" (A) displays the
routing table (Layer 3). "show mac address-table" (B) shows switch
MAC address tables, not router ARP entries. "show cdp neighbors" (E)
displays Cisco Discovery Protocol information about adjacent devices,
not ARP mappings.
6. A technician is configuring VLANs on a Cisco switch and needs to
ensure that traffic from multiple VLANs can traverse a single link
between two switches. Which switch port configuration should the
technician apply to support this requirement?
A. Access mode with a single VLAN assignment
B. Trunk mode with 802.1Q encapsulation to carry multiple
VLAN tags
C. Dynamic desirable mode to negotiate trunking automatically
D. Trunk mode with 802.1Q encapsulation to carry multiple
VLAN tags
E. Dynamic auto mode with native VLAN configuration
Rationale: B is correct because trunk ports use IEEE 802.1Q tagging
to carry frames from multiple VLANs across a single physical link, with
each frame tagged with its VLAN ID. Access mode (A) carries traffic for
only one VLAN. Dynamic modes (C, E) may negotiate trunking but do
not guarantee the required configuration; explicit trunk mode with
802.1Q ensures predictable behavior. The native VLAN (E) handles
untagged traffic but does not alone enable multi-VLAN transport.
7. A network engineer is analyzing network performance and observes
that collision domains are causing significant retransmissions on a
legacy Ethernet segment. Which networking device should be
implemented to eliminate collisions and create separate collision
domains for each connected device?
A. Hub, because it regenerates signals to extend network distance
B. Repeater, because it amplifies signals to overcome attenuation
C. Switch, because it creates a dedicated collision domain per
NETWORKS FINAL EXAM
(2026/2027) | 200 VERIFIED Q&A
WITH RATIONALES | CISCO
NETWORKING ACADEMY | PDF
DOWNLOAD A+ GUARANTEED
CCNA 1 Final Exam (Introduction to Networks) – Study Guide
& Practice Questions
A+ Certified Success | 200 High-Yield Practice Questions with
Detailed Rationales (2026/2027)
1. A network administrator is configuring a new Cisco switch for the first
time and needs to establish a secure management connection. The
administrator wants to ensure that all remote management traffic is
encrypted to prevent eavesdropping on sensitive configuration
commands. Which protocol should the administrator configure on the
switch to meet this security requirement while maintaining compatibility
with standard terminal emulation software?
A. Telnet, because it is universally supported and requires minimal
configuration overhead
B. SSH (Secure Shell), because it provides encrypted remote
access using strong authentication and data integrity
verification
C. HTTP, because it allows web-based management through any
standard browser
D. SSH (Secure Shell), because it provides encrypted remote
access using strong authentication and data integrity
verification
E. SNMPv2c, because it supports community-based authentication for
network management
Rationale: B is correct because SSH encrypts all session data
including usernames, passwords, and configuration commands,
protecting against man-in-the-middle attacks and packet sniffing.
Telnet (A) transmits data in plaintext, making it insecure for
,management traffic. HTTP (C) is unencrypted; HTTPS would be
required for web management security. SNMPv2c (E) uses plaintext
community strings and is not designed for interactive management
sessions.
2. A technician is troubleshooting a connectivity issue between two
directly connected routers. The interface status shows "up/up" on both
routers, but ping attempts between the directly connected interfaces fail.
The technician verifies that IP addresses are configured correctly and
belong to the same subnet. Which Layer 2 issue should the technician
investigate next to resolve this connectivity problem?
A. Mismatched subnet masks preventing proper network identification
B. Encapsulation mismatch, where one router interface uses
HDLC and the other uses PPP, causing frame rejection
C. Incorrect default gateway configuration preventing inter-network
communication
D. Encapsulation mismatch, where one router interface uses
HDLC and the other uses PPP, causing frame rejection
E. ACL blocking ICMP echo requests on one of the router interfaces
Rationale: B is correct because serial interfaces require matching
encapsulation protocols (HDLC is Cisco default; PPP is standards-
based) to successfully exchange frames. Even with Layer 3 connectivity
configured properly, mismatched Layer 2 encapsulation causes frames
to be discarded. Subnet masks (A) and default gateways (C) are Layer 3
concerns already verified. ACLs (E) could block traffic but
encapsulation mismatch is a more fundamental Layer 2 issue to check
first.
3. A network engineer is designing an IPv4 addressing scheme for a new
branch office that requires support for 500 host devices on a single
subnet while minimizing wasted address space. Which subnet mask
provides the most efficient allocation that meets the host requirement?
A. 255.255.255.0 (/24) providing 254 usable host addresses
B. 255.255.254.0 (/23) providing 510 usable host addresses
C. 255.255.252.0 (/22) providing 1,022 usable host addresses
D. 255.255.254.0 (/23) providing 510 usable host addresses
E. 255.255.248.0 (/21) providing 2,046 usable host addresses
,Rationale: B is correct because a /23 subnet (255.255.254.0) provides
2^9 - 2 = 510 usable host addresses, which accommodates 500 hosts
with minimal waste. A /24 (A) only provides 254 hosts, insufficient for
the requirement. A /22 (C) and /21 (E) provide adequate addresses but
waste significant address space, violating efficient allocation principles.
The "-2" accounts for network and broadcast addresses.
4. During a network audit, a security analyst discovers that several
workstations are configured with APIPA addresses in the 169.254.0.0/16
range. What does this addressing configuration indicate about the
network connectivity status of these devices?
A. The devices are successfully obtaining addresses from a DHCP server
on a different subnet
B. The devices failed to obtain an IP address from a DHCP
server and self-assigned a link-local address
C. The devices are configured with static addresses for a private
management network
D. The devices failed to obtain an IP address from a DHCP
server and self-assigned a link-local address
E. The devices are participating in a zero-configuration networking
protocol for service discovery
Rationale: B is correct because APIPA (Automatic Private IP
Addressing) assigns addresses in 169.254.0.0/16 when a DHCP client
cannot contact a DHCP server after multiple attempts. This indicates
DHCP server unavailability, network connectivity issues, or DHCP
scope exhaustion. Option A is incorrect because DHCP-assigned
addresses would not be in the APIPA range. Option C describes manual
static configuration, not automatic assignment. Option E describes
protocols like mDNS, not APIPA behavior.
5. A network administrator needs to verify the Layer 2 address of a
directly connected device to troubleshoot an ARP-related connectivity
issue. Which command should the administrator use on a Cisco router to
display the IP-to-MAC address mappings currently stored in the ARP
cache?
A. show ip route
B. show mac address-table
C. show ip arp
, D. show ip arp
E. show cdp neighbors detail
Rationale: C is correct because "show ip arp" displays the Address
Resolution Protocol cache containing IP address to MAC address
mappings learned on router interfaces. "show ip route" (A) displays the
routing table (Layer 3). "show mac address-table" (B) shows switch
MAC address tables, not router ARP entries. "show cdp neighbors" (E)
displays Cisco Discovery Protocol information about adjacent devices,
not ARP mappings.
6. A technician is configuring VLANs on a Cisco switch and needs to
ensure that traffic from multiple VLANs can traverse a single link
between two switches. Which switch port configuration should the
technician apply to support this requirement?
A. Access mode with a single VLAN assignment
B. Trunk mode with 802.1Q encapsulation to carry multiple
VLAN tags
C. Dynamic desirable mode to negotiate trunking automatically
D. Trunk mode with 802.1Q encapsulation to carry multiple
VLAN tags
E. Dynamic auto mode with native VLAN configuration
Rationale: B is correct because trunk ports use IEEE 802.1Q tagging
to carry frames from multiple VLANs across a single physical link, with
each frame tagged with its VLAN ID. Access mode (A) carries traffic for
only one VLAN. Dynamic modes (C, E) may negotiate trunking but do
not guarantee the required configuration; explicit trunk mode with
802.1Q ensures predictable behavior. The native VLAN (E) handles
untagged traffic but does not alone enable multi-VLAN transport.
7. A network engineer is analyzing network performance and observes
that collision domains are causing significant retransmissions on a
legacy Ethernet segment. Which networking device should be
implemented to eliminate collisions and create separate collision
domains for each connected device?
A. Hub, because it regenerates signals to extend network distance
B. Repeater, because it amplifies signals to overcome attenuation
C. Switch, because it creates a dedicated collision domain per
