Mixed Deck — All CCST Topics Flashcards

Which protocol is used to automatically assign IP addresses, subnet masks, default gateways, and DNS server addresses to network hosts?

Answer: DHCP

DHCP (Dynamic Host Configuration Protocol) automatically provides IP configuration parameters to network clients, eliminating the need for manual configuration.

What is the broadcast address for the subnet 10.0.0.64/26?

Answer: 10.0.0.127

The /26 block starting at .64 spans .64–.127, so .127 is the broadcast address.

Which command on a Cisco router shows the current routing table including all known routes?

Answer: show ip route

The 'show ip route' command displays the router's routing table, listing all known networks with their associated routing protocol, administrative distance, metric, and next-hop information.

A user reports intermittent connectivity drops every few minutes. Which tool would BEST help identify whether the issue is packet loss or latency spikes?

Answer: ping with extended count

Running ping with a high count (e.g., ping -n 100) over time reveals packet loss percentages and latency variations.

Which Cisco IOS command displays the MAC address table on a Catalyst switch?

Answer: show mac address-table

The 'show mac address-table' command on a Cisco Catalyst switch displays all learned MAC addresses and their associated port and VLAN information.

A network administrator wants to control which devices can connect to a specific switch port based on MAC addresses. Which feature should be configured?

Answer: Port security

Port security allows a switch port to be locked to specific MAC addresses, restricting which devices can connect to that port.

A user can ping a server by IP but not by hostname. Which service is most likely failing?

Answer: DNS

DNS (Domain Name System) translates hostnames to IP addresses; if name resolution fails, connectivity by hostname fails even though IP-level connectivity works.

What is the purpose of a default gateway in network configuration?

Answer: It is the router IP address that hosts send traffic to when the destination is on a remote network

A default gateway is the IP address of the local router interface that hosts use to forward packets destined for networks outside their own subnet.

What is the purpose of a wireless channel in an 802.11 network?

Answer: To divide the frequency band into smaller segments to reduce interference

Wireless channels divide the available frequency spectrum into smaller segments, allowing multiple nearby networks to operate simultaneously with reduced interference.

Which protocol operates at the Transport layer and provides connection-oriented, reliable data delivery?

Answer: TCP

TCP (Transmission Control Protocol) uses a three-way handshake, sequencing, and acknowledgments to ensure reliable, ordered data delivery.

What is the PRIMARY purpose of obtaining CCST certification in Cisco Certified Support Technician Networking?

Answer: To demonstrate verified competency and adherence to professional standards

Certification demonstrates verified competency and adherence to professional standards.

Which assessment method provides the MOST reliable data for CCST professionals making critical decisions?

Answer: Standardized tools combined with professional observation

Combining standardized tools with professional observation provides the most comprehensive data.

What technology does 802.11ax use to allow multiple clients to transmit and receive simultaneously, improving efficiency in dense environments?

Answer: OFDMA

OFDMA (Orthogonal Frequency Division Multiple Access) in Wi-Fi 6 allows simultaneous communication with multiple clients by dividing channels into sub-carriers.

A technician discovers that a switch port is receiving BPDU frames from an unauthorized device. Which Cisco feature should be enabled to protect against rogue switches?

Answer: BPDU Guard

BPDU Guard disables a port when unexpected BPDU frames are received, preventing unauthorized switches from influencing the Spanning Tree topology.

What is the purpose of CDP (Cisco Discovery Protocol)?

Answer: To allow Cisco devices to discover and share information about directly connected Cisco neighbors

CDP is a Cisco-proprietary Layer 2 protocol that allows Cisco devices to advertise and discover directly connected Cisco neighbors, sharing device type, IP address, and port information.

Which Cisco IOS command would you use to verify connectivity to a remote device and display round-trip time?

Answer: ping

The 'ping' command sends ICMP Echo Request messages to a destination and reports the round-trip time and success rate, verifying basic IP connectivity.

A device receives the IP address 169.254.45.10 automatically. What does this indicate?

Answer: DHCP was unavailable and APIPA assigned a link-local address

A 169.254.x.x address is an APIPA (Automatic Private IP Addressing) address assigned by Windows when no DHCP server is reachable.

A workstation can ping its default gateway but cannot reach the internet. What should the technician check NEXT?

Answer: Verify the default gateway's routing table and WAN connectivity

Since the gateway is reachable, the issue is likely upstream — the gateway's WAN link or routing table should be checked next.

What is a DHCP lease?

Answer: A temporary IP address assignment for a specified period of time

A DHCP lease is the amount of time a client is allowed to use an IP address assigned by the DHCP server before it must renew or release the address.

A host with IP 192.168.10.50/28 tries to communicate with 192.168.10.65. Are these hosts on the same subnet?

Answer: No, they are on different subnets

/28 creates 16-address blocks; .50 belongs to 192.168.10.48–.63 and .65 belongs to 192.168.10.64–.79, so they are on different subnets.