Mixed Deck — All ICND1 Topics Flashcards
100 cards from real ICND1 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 20 Mixed Deck — All ICND1 Topics flashcards as text
Which statement best describes a Switched Virtual Interface (SVI)?
Answer: A logical Layer 3 interface associated with a VLAN used for inter-VLAN routing or management
An SVI is a virtual Layer 3 interface on a multilayer switch tied to a VLAN, providing a gateway IP address for hosts in that VLAN.
How many IPv4 addresses does a /23 subnet contain in total?
Answer: 512
A /23 has 9 host bits, so 2^9 = 512 total addresses (510 usable hosts).
What is the valid host range for the subnet 192.168.10.64/26?
Answer: 192.168.10.65 – 192.168.10.126
A /26 has 64 addresses; network=.64, broadcast=.127, so valid hosts are .65 through .126.
Which professional attribute is most valued in subnetting within the ICND1 field?
Answer: Accountability and commitment to standards
Accountability and commitment to professional standards build trust and ensure consistent, high-quality practice.
How does the ICND1 body of knowledge relate to daily professional practice?
Answer: It provides the foundational framework that guides decision-making and standard practices
The body of knowledge provides the foundational framework of principles, standards, and best practices that professionals use to guide their daily decision-making, ensure consistent quality, and maintain alignment with industry standards.
What is the default OSPF hello interval on a broadcast multi-access network?
Answer: 10 seconds
The default OSPF Hello interval on broadcast and point-to-point links is 10 seconds.
Which STP port state immediately follows the Listening state in the port state transition?
Answer: Learning
After Listening, a port transitions to Learning, where it builds the MAC address table but does not yet forward user traffic.
What is a 'zero-day' vulnerability?
Answer: A security flaw exploited before the vendor has released a patch
A zero-day vulnerability is a security flaw unknown to the vendor, meaning zero days have passed since the vendor became aware, giving no time to patch before exploitation.
In VLSM design, which benefit does it provide over classful subnetting?
Answer: Allows different subnet sizes within the same network
VLSM lets you apply different prefix lengths to different subnets, reducing address waste.
Which protocol is commonly used to dynamically assign IP addresses in a LAN?
Answer: DHCP
DHCP (Dynamic Host Configuration Protocol) is a network protocol specifically designed to automatically assign IP addresses and other network configuration parameters to devices on a network. This eliminates the need for manual configuration, simplifying network administration and ensuring efficient use of IP addresses. It is crucial for managing large and dynamic networks.
Which IPv4 address range is reserved for multicast?
Answer: 224.0.0.0 – 239.255.255.255
Class D addresses (224.0.0.0–239.255.255.255) are reserved for multicast group communication.
In PPP authentication, which protocol transmits the username and password in cleartext?
Answer: PAP
PAP (Password Authentication Protocol) sends credentials in cleartext, making it vulnerable to interception.
What role does collaboration play in troubleshooting for ICND1 professionals?
Answer: It enhances outcomes through diverse perspectives and shared expertise
Collaboration leverages diverse perspectives and combined expertise to achieve better outcomes than any individual could alone.
A router needs to forward DHCP broadcasts from clients on one subnet to a DHCP server on another subnet. Which command enables this?
Answer: ip helper-address
The 'ip helper-address' command on the client-facing interface forwards DHCP broadcasts as unicast to the specified DHCP server.
Which professional attribute is most valued in ipv4 and ipv6 within the ICND1 field?
Answer: Accountability and commitment to standards
Accountability and commitment to professional standards build trust and ensure consistent, high-quality practice.
Which statement correctly describes full-duplex Ethernet operation?
Answer: Devices can send and receive simultaneously, eliminating collisions
Full-duplex allows simultaneous send and receive by using separate wire pairs, eliminating collision domains.
Which IPv6 transition mechanism encapsulates IPv6 packets inside IPv4 packets to traverse IPv4 networks?
Answer: 6to4 tunneling
6to4 tunneling automatically encapsulates IPv6 traffic in IPv4 packets (protocol 41) to cross IPv4-only infrastructure.
A /24 network is subnetted into /28 subnets. How many hosts can each subnet support?
Answer: 14
A /28 leaves 4 host bits; 2^4 - 2 = 14 usable host addresses per subnet.
Which command changes the OSPF hello interval on an interface to 5 seconds?
Answer: ip ospf hello-interval 5
The interface-level command 'ip ospf hello-interval 5' sets the OSPF hello interval to 5 seconds.
What is the network address for the host IP 10.4.77.130/25?
Answer: 10.4.77.128
A /25 mask is 255.255.255.128; ANDing 130 with 128 gives 128, so the network is 10.4.77.128.