Network Essential Version A (LE) Practice Test

These questions are part of the practice quiz. Start practicing

• What does CIDR notation /24 mean?
• DHCPREQUEST: what does it describe?
• Which service translates a domain name to an IP address?
• The IPv6 packet is transported inside an IPv4 packet. This describes which co-existence method?
• What is NAT traversal and which examples exist?
• IPv6 stateless vs stateful address autoconfiguration?
• Which statement best describes ARP in networking?
• Which statement correctly contrasts a network switch and a hub?
• What is the purpose of a firewall?
• Convert the hexadecimal value 0x2DF to decimal.
• How many bits are in each IPv6 address hextet?
• What must be enabled on trunk ports to carry multiple VLANs?
• What is the primary role of a DMZ in network security?
• What cable type is typically used for 1000BASE-T Ethernet?
• What does traceroute show?
• Which statement best describes a rationale for using standards to develop network protocols?
• Inter-VLAN communication requires what mechanism?
• What is the subnet ID for the network 192.168.165.189 with a /26 subnet mask?
• What is the DHCP DORA sequence?
• What is a MAC address?
• What is QoS in networking?
• Which statement best describes single-mode fiber for long-distance use?
• What is latency in networking?
• What is the primary purpose of the Transport layer in the OSI model?
• Which statement contrasts unicast, broadcast, and multicast traffic models?
• Why is NAT used in networks?
• CIDR is a addressing method that largely supersedes what?
• Which measure helps mitigate ARP poisoning in a network?
• What is RIP and its main limitation?
• Which of the following describes the dual-stack approach?
• In IOS command structure, what is the difference between a keyword and an argument?
• What is a subnet mask and how is it used?
• Which statement best describes TCP compared with UDP?
• Which statement best describes OSPF?
• Which device forwards packets between networks using IP addresses?
• What is a subnet mask?
• Convert the IPv6 address 0090:FEA0:00DA:F4A8:008A:0000:0000:0000 to its most compressed form.
• Which IPv4 address ranges are reserved for private use?
• How many bits are in an IPv6 address?
• A valid public IPv4 or IPv6 address is needed in order for devices to communicate over the internet.
• What is a VLAN trunk?
• Which statement about multicast transmission is true?
• What is a collision domain?
• A DHCP client on an Ethernet segment with a DHCP server at 192.168.1.1 will obtain an IP by sending which message?
• What is QoS?
• With a prefix length of /20, what is the corresponding subnet mask?
• Which of the following IP addresses is private?
• Describe the purpose and benefits of VLANs.
• Which statement best describes IPv6 addressing compared to IPv4?
• Which device reduces collision domains by segmenting a network and forwards frames based on MAC addresses?
• Which statement correctly differentiates symmetric encryption from asymmetric encryption?
• Explain the difference between TCP and UDP.
• Which statement about IPv6 zero compression is true?
• What type of address does a switch use to build a MAC address table?
• ARP is used to map IP addresses to which of the following?
• On a VLAN trunk, what is the purpose of VLAN tagging such as 802.1Q?
• In the Cisco IOS command Switch(config)# Interface FastEthernet 0/1, what is the term used to describe the 0/1 portion?
• What is UPnP in NAT traversal?
• Which statement about dynamic routing protocols is true?
• DHCP uses which IP address as the destination when requesting an address for dynamic configuration?
• Describe link aggregation (EtherChannel) and its primary benefit.
• Explain route summarization.
• Which port number is associated with HTTPS?
• Convert the IPv6 address 0678:0DF5:0000:CB34:0034:0000:0000:02B0 to its most compressed form.
• What is NAT and why is it used?
• What is the minimum cabling category required for 1000BASE-T networks?
• What is a default route?
• What is the purpose of a switch's MAC address table?
• Which statement correctly distinguishes a collision domain from a broadcast domain?
• What is SNMP used for?
• What is the purpose of a WAN accelerator or CPE in a network?
• What is dual-stack IPv6/IPv4?
• If a host's ARP cache has no mapping entry for a destination on a remote network, to what destination MAC address will the ARP request be sent?
• What is the broadcast address of the network 192.168.100.200 255.255.255.248?
• What is a key purpose of NAT in Internet connectivity?
• Which network technology allows devices to communicate using both IPv4 and IPv6 addressing at the same time?
• DNS A vs AAAA: what do they map?
• What is a ping test and what can it indicate?
• Usable hosts per /27 subnet?
• Which protocol maps IP addresses to MAC addresses on a local network?
• What addressing information is recorded by a switch to build its MAC address table?
• Convert the decimal number 593 to hexadecimal.
• What is ARP used for?
• During a DHCP discovery, which destination MAC address is used by the client to reach all devices on the LAN?
• Which common home WLAN frequency band is widely used for wireless networking?
• What is a primary function of the Transport layer in TCP/IP?
• What is the subnet ID and host ID?
• In the troubleshooting framework, which step is performed last?
• Which property describes Spanning Tree Protocol (STP)?
• Which command configures a name on the router?
• Which command provides security on the console?
• What are common network troubleshooting steps?
• What describes topology in networking?
• What is the primary purpose of a trunk port on a switch?
• Which statement correctly describes broadcast and multicast addresses?
• With a /19 prefix length, what is the corresponding subnet mask?
• Which statement correctly describes the address lengths of IPv4 and IPv6?
• What is a public/private key pair used for?
• Which of the following is NOT a mitigation for ARP poisoning?
• Which single command sets the console password value on a router?
• DHCP is used to:
• Which tool shows per-hop latency and path to a destination?
• At which OSI layer does a network switch primarily operate?
• In IPv6 addressing, what does the "::" notation represent?
• What is DHCP snooping primarily used for?
• Which command restricts VTY access to SSH only?
• Which option represents the default subnet mask for Class C addresses?
• Traceroute is used to determine what?
• Which statement best describes subnet design in a network?
• Which statement accurately describes the difference between a switch and a router?
• What is ARP and why is it used?
• DHCPOFFER: what does it describe?
• Which statement about multicast delivery is correct?
• In Cisco IOS, which is the correct order to reach the mode where configuration commands are entered?
• With a /19 subnet mask, how many usable host addresses are available in the subnet?
• DNS serves which primary function?
• What factors guide a router in selecting a path when multiple routes exist?
• Which statement best describes a hub's behavior in a network?
• Which statement best describes IPv6 with respect to NAT usage?
• For a 192.168.1.0/24 network needing at least 6 subnets, what is the new subnet mask and how many usable hosts per subnet?
• IPv6 addresses are written in what form?
• IPv6 packets are converted into IPv4 packets, and vice versa. This describes which co-existence method?
• What is the difference between IPv4 and IPv6 addressing?
• On a router with an enabled secret password but no console password, which mode is displayed upon boot?
• In a subnet, what is the role of the default gateway?
• Convert decimal 2001 to hexadecimal.
• Which statement best describes collision domains and the effect of switches?
• What is the primary use of a subnet calculator?
• In a VLAN-enabled network, which statement is true?
• What is indicated by the term throughput?
• Which statement describes throughput?
• What service is responsible for automatically assigning IP configuration to clients?
• What information does a typical ping report provide?
• Which device typically has a MAC address permanently embedded?
• Which IPv6 autoconfiguration method relies on a DHCPv6 server to assign addresses?
• An IPv6 address consists of how many 16-bit blocks, also known as hextets?
• What is DNS caching?
• Which description best defines port security on a switch?
• What is fiber optic attenuation?
• When managing a switch with SSH, which statement is true?
• What is the primary purpose of the Domain Name System (DNS)?
• What is the primary purpose of a router in a network?
• What is VLAN hopping?
• What is the difference between unicast, broadcast, and multicast?
• Which addresses are involved in ARP to perform its function on a local network?
• Which statement best describes IPv4 vs IPv6 addressing usage in terms of NAT?
• If multiple devices are connected to a hub, what is true about their collision domain?
• What is the primary purpose of the ARP protocol?
• Why do VLANs require tagging on trunk ports?
• What is trunking?
• Which command tests reachability to a specific host?
• What is the difference between a bridge and a switch?
• A DHCP pool is configured with 192.168.10.0/24 and three printers require reserved static IPs from the pool. How many IP addresses remain for other hosts?
• What is DNS caching?
• Which statement correctly describes the typical IPv4 address classes and their default masks?
• What does the service password-encryption command do on Cisco devices?
• Explain the TCP three-way handshake.
• Which statement accurately contrasts a hub and a switch?
• IPv6-to-IPv4 translation is best described by which statement?
• DNS caching helps improve network performance by:
• What is the purpose of using SSH to connect to a router?
• Which device primarily identifies a network interface on the local link using a specific address?
• Which statement best describes single-mode fiber?
• Which command displays a message when the router is accessed?
• Which statement about 802.1Q trunking is true?
• Which statement describes DHCP and its port usage?
• What is a DMZ and its purpose?
• What is ARP poisoning and how can it be mitigated?
• Which method allows IPv4 and IPv6 packets to coexist in the same network?
• In IPv6, which mechanism uses router advertisements to configure addresses without DHCP?
• DHCPACK: what does it indicate?
• What is the purpose of the subnet mask when used with an IP address?
• The router primarily operates on which OSI layer to forward packets between IP networks?
• What is a default route and when is it used?
• Which statement about Port Security on switches is correct?
• Which statement best describes the dual-stack approach in networks?
• What is the role of a firewall?
• In a standard /24 network, how many usable host IP addresses are available?
• A MAC address is permanently embedded on the NIC.
• Which statement best describes a VLAN?
• Which IOS mode is used to configure global device settings such as hostname?
• Which layer uses MAC addresses to forward frames within a local network?
• Which statement best describes the purpose of STP in a switched network?
• Which dotted-decimal mask represents a /26 subnet?
• A PC on a LAN connects to the internet immediately after the OS boots, with no manual IP configuration. Which feature most likely enabled this?
• Which IPv6 address block represents the default route?
• What is OSPF?
• What is the function of a VPN?
• What is TURN in NAT traversal?
• What is a default gateway?
• A network administrator establishes a connection to a switch via SSH. What characteristic uniquely describes the SSH connection?
• Which of the following are NAT traversal techniques?
• What is STUN used for in NAT traversal?
• The ARP table maps which two types of addresses together?
• With a subnet mask of 255.255.255.240 (/28), how many usable IP addresses are available?
• What is the purpose of 802.1Q?
• Which of the following is a benefit of using a layered network model?
• Which IPv4 multicast address range is reserved to reach multicast groups on a local network?
• Which of the following are private IPv4 address ranges?
• DHCPDISCOVER: what does it describe?
• Which type of wireless communication is based on 802.11 standards?
• Which command would you use to configure console line security on a Cisco IOS device?
• To prevent neighbors from discovering your wireless network, what action should you take?
• Which is the correct compressed form of the IPv6 hextet 008A?
• Which type of access is secured on a Cisco router or switch with the enable secret command?
• Which DHCP message is sent by the server in response to a client's initial DISCOVER?
• Which statement best describes the purpose of the banner motd command?
• Where will a router first search for a valid IOS image to load when powered on?
• What is the significance of SNMP v3?
• What type of attack is known as the ping of death?
• Which command sequence configures the router's hostname to CL1?
• Which command shows active connections and listening ports?
• Which of the following is a private IP address?
• What does DHCP snooping typically create and use?
• Which IOS mode is used to configure an individual interface?
• What does topology describe in a network?
• What is SNMP used for?
• Which IPv4 class does 1.0.0.0/8 belong to?
• Why would someone use IPv6?
• Which method manages contention-based access on 802.11 wireless networks such as 802.11n?
• What is a broadcast domain?
• Which statement correctly contrasts static routing and dynamic routing?
• Which statement best describes WPA2/WPA3?
• Borrowing 3 bits from the host portion of a /24 yields how many subnets?
• Which networking trend enables each customer to have a separate web server on a single physical CPU?
• IPv6-in-IPv4 tunneling involves which of the following?
• Which DHCP message represents the client acknowledging the lease after receiving an offer?
• Name common WAN technologies.
• What is NAT traversal?
• Which command traces the route to a destination?
• What is a VPN and its purpose?
• In hexadecimal notation, what is the hexadecimal representation of decimal 2001?
• Which command would you use on Windows to view the local IP configuration?
• Convert the decimal number 620 to hexadecimal.
• What is DNS propagation?
• What is a network diagram and why is it important?
• What is port-based authentication?
• With a subnet mask of 255.255.255.248, how many usable IP addresses are available?