CCNA 1 Exam 2025 with Complete Solution

What is a characteristic of a fault tolerant network? a network that protects confidential information from unauthorized access a network that can expand quickly to support new users and applications without impacting the performance of the service delivered to existing users a network that supports a mechanism for managing congestion and ensuring reliable delivery of content to all users a network that recovers quickly when a failure occurs and depends on redundancy to limit the impact of a failure - ANSWER a network that recovers quickly when a failure occurs and depends on redundancy to limit the impact of a failure Three bank employees are using the corporate network. The first employee uses a web browser to view a company web page in order to read some announcements. The second employee accesses the corporate database to perform some financial transactions. The third employee participates in an important live audio conference with other corporate managers in branch offices. If QoS is implemented on this network, what will be the priorities from highest to lowest of the different data types? audio conference, financial transactions, web page financial transactions, web page, audio conference audio conference, web page, financial transactions financial transactions, audio conference, web page - ANSWER audio conference, financial transactions, web page What is a benefit of using cloud computing in networking? End users have the freedom to use personal tools to access information and communicate across a business network. Network capabilities are extended without requiring investment in new infrastructure, personnel, or software. Technology is integrated into every-day appliances allowing them to interconnect with other devices, making them more 'smart' or automated. Home networking uses existing electrical wiring to connect devices to the network wherever there is an electrical outlet, saving the cost of installing data cables. - ANSWER Network capabilities are extended without requiring investment in new infrastructure, personnel, or software. What is the function of the shell in an OS? It interacts with the device hardware. It interfaces between the users and the kernel. It provides dedicated firewall services. It provides the intrusion protection services for the device. - ANSWER It interfaces between the users and the kernel. Which connection provides a secure CLI session with encryption to a Cisco switch? a console connection an AUX connection a Telnet connection an SSH connection - ANSWER an SSH connection A network technician is attempting to configure an interface by entering the following command: SanJose(config)# ip address 192.168.2.1 255.255.255.0. The command is rejected by the device. What is the reason for this? The command is being entered from the wrong mode of operation. The command syntax is wrong. The subnet mask information is incorrect. The interface is shutdown and must be enabled before the switch will accept the IP address - ANSWER The command is being entered from the wrong mode of operation. An administrator uses the Ctrl-Shift-6 key combination on a switch after issuing the ping command. What is the purpose of using these keystrokes? to restart the ping process to interrupt the ping process to exit to a different configuration mode to allow the user to complete the command - ANSWER to interrupt the ping process Refer to the exhibit. A network administrator is configuring access control to switch SW1. If the administrator uses a console connection to connect to the switch, which password is needed to access user EXEC mode? letmein secretin lineconin linevtyin - ANSWER lineconin On which switch interface would an administrator configure an IP address so that the switch can be managed remotely? FastEthernet0/1 VLAN 1 vty 0 console 0 - ANSWER VLAN 1 What is an advantage to using a protocol that is defined by an open standard? A company can monopolize the market. The protocol can only be run on equipment from a specific vendor. An open standard protocol is not controlled or regulated by standards organizations. It encourages competition and promotes choices. - ANSWER It encourages competition and promotes choices. What are two benefits of using a layered network model? (Choose two.) It assists in protocol design. It speeds up packet delivery. It prevents designers from creating their own model. It prevents technology in one layer from affecting other layers. It ensures a device at one layer can function at the next higher layer. - ANSWER It assists in protocol design. It prevents technology in one layer from affecting other layers. Which two OSI model layers have the same functionality as two layers of the TCP/IP model? (Choose two.) data link network physical session transport - ANSWER network transport Which name is assigned to the transport layer PDU? bits data frame packet segment - ANSWER segment A network administrator is measuring the transfer of bits across the company backbone for a mission critical financial application. The administrator notices that the network throughput appears lower than the bandwidth expected. Which three factors could influence the differences in throughput? (Choose three.) the amount of traffic that is currently crossing the network the sophistication of the encapsulation method applied to the data the type of traffic that is crossing the network the latency that is created by the number of network devices that the data is crossing the bandwidth of the WAN connection to the Internet the reliability of the gigabit Ethernet infrastructure of the backbone - ANSWER the amount of traffic that is currently crossing the network the latency that is created by the number of network devices that the data is crossing the type of traffic that is crossing the network What is a characteristic of UTP cabling? cancellation cladding immunity to electrical hazards woven copper braid or metallic foil - ANSWER cancellation hat are two characteristics of fiber-optic cable? (Choose two.) It is not affected by EMI or RFI. Each pair of cables is wrapped in metallic foil. It combines the technique of cancellation, shielding, and twisting to protect data. It typically contains 4 pairs of fiber-optic wires. It is more expensive than UTP cabling is. - ANSWER It is not affected by EMI or RFI. It is more expensive than UTP cabling is. What is a characteristic of the LLC sublayer? It provides the logical addressing required that identifies the device. It provides delimitation of data according to the physical signaling requirements of the medium. It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media. It defines software processes that provide services to the physical layer. - ANSWER It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media. A network team is comparing physical WAN topologies for connecting remote sites to a headquarters building. Which topology provides high availability and connects some, but not all, remote sites? mesh partial mesh hub and spoke point-to-point - ANSWER partial mesh What method is used to manage contention-based access on a wireless network? CSMA/CD priority ordering CSMA/CA token passing - ANSWER CSMA/CA What are the three primary functions provided by Layer 2 data encapsulation? (Choose three.) error correction through a collision detection method session control using port numbers data link layer addressing placement and removal of frames from the media detection of errors through CRC calculations delimiting groups of bits into frames conversion of bits into data signals - ANSWER data link layer addressing detection of errors through CRC calculations delimiting groups of bits into frames What will a host on an Ethernet network do if it receives a frame with a destination MAC address that does not match its own MAC address? It will discard the frame. It will forward the frame to the next host. It will remove the frame from the media. It will strip off the data-link frame to check the destination IP address. - ANSWER It will discard the frame. Which frame forwarding method receives the entire frame and performs a CRC check to detect errors before forwarding the frame? cut-through switching store-and-forward switching fragment-free switching fast-forward switching - ANSWER store-and-forward switching Refer to the exhibit. If host A sends an IP packet to host B, what will the destination address be in the frame when it leaves host A? DD:DD:DD:DD:DD:DD 172.168.10.99 CC:CC:CC:CC:CC:CC 172.168.10.65 BB:BB:BB:BB:BB:BB AA:AA:AA:AA:AA:AA - ANSWER BB:BB:BB:BB:BB:BB What addresses are mapped by ARP? destination MAC address to a destination IPv4 address destination IPv4 address to the source MAC address destination IPv4 address to the destination host name destination MAC address to the source IPv4 address - ANSWER destination MAC address to a destination IPv4 address What are two services provided by the OSI network layer? (Choose two.) performing error detection routing packets toward the destination encapsulating PDUs from the transport layer placement of frames on the media collision detection - ANSWER routing packets toward the destination encapsulating PDUs from the transport layer What are two functions of NVRAM? (Choose two.) to store the routing table to retain contents when power is removed to store the startup configuration file to contain the running configuration file to store the ARP table - ANSWER to retain contents when power is removed to store the startup configuration file Refer to the exhibit. What will be the result of entering this configuration the next time a network administrator connects a console cable to the router and no additional commands have been entered? The administrator will be required to enter Cisco123. The administrator will be required to enter Cisco234. The administrator will be required to enter Cisco789. The administrator will be presented with the R1 prompt. - ANSWER The administrator will be presented with the R1 prompt. What is the dotted decimal representation of the IPv4 address ...? 192.0.2.199 198.51.100.201 203.0.113.211 209.165.201.223 - ANSWER 203.0.113.211 What are three characteristics of multicast transmission? (Choose three.) The source address of a multicast transmission is in the range of 224.0.0.0 to 224.0.0.255. A single packet can be sent to a group of hosts. Multicast transmission can be used by routers to exchange routing information. Routers will not forward multicast addresses in the range of 224.0.0.0 to 224.0.0.255. Computers use multicast transmission to request IPv4 addresses. Multicast messages map lower layer addresses to upper layer addresses - ANSWER A single packet can be sent to a group of hosts. Multicast transmission can be used by routers to exchange routing information. Routers will not forward multicast addresses in the range of 224.0.0.0 to 224.0.0.255. What are the three ranges of IP addresses that are reserved for internal private use? (Choose three.) 10.0.0.0/8 64.100.0.0/14 127.16.0.0/12 172.16.0.0/12 192.31.7.0/24 192.168.0.0/16 - ANSWER 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 What purpose does NAT64 serve in IPv6? It converts IPv6 packets into IPv4 packets. It translates private IPv6 addresses into public IPv6 addresses. It enables companies to use IPv6 unique local addresses in the network. It converts regular IPv6 addresses into 64-bit addresses that can be used on the Internet. It converts the 48-bit MAC address into a 64-bit host address that can be used for automatic host addressing. - ANSWER It converts IPv6 packets into IPv4 packets. What is the most compressed representation of the IPv6 address 2001:0000:0000:abcd:0000:0000:0000:0001? 2001:0:abcd::1 2001:0:0:abcd::1 2001::abcd::1 2001:0000:abcd::1 2001::abcd:0:1 - ANSWER 2001:0:0:abcd::1 Which range of link-local addresses can be assigned to an IPv6-enabled interface? FEC0::/10 FDEE::/7 FE80::/10 FF00::/8 - ANSWER FE80::/10 How many valid host addresses are available on an IPv4 subnet that is configured with a /26 mask? - ANSWER 62 A site administrator has been told that a particular network at the site must accommodate 126 hosts. Which subnet mask would be used that contains the required number of host bits? 255.255.255.0 255.255.255.128 255.255.255.224 255.255.255.240 - ANSWER 255.255.255.128 Which statement is true about variable-length subnet masking? Each subnet is the same size. The size of each subnet may be different, depending on requirements. Subnets may only be subnetted one additional time. Bits are returned, rather than borrowed, to create additional subnets. - ANSWER The size of each subnet may be different, depending on requirements. Which scenario describes a function provided by the transport layer? A student is using a classroom VoIP phone to call home. The unique identifier burned into the phone is a transport layer address used to contact another network device on the same network. A student is playing a short web-based movie with sound. The movie and sound are encoded within the transport layer header. A student has two web browser windows open in order to access two web sites. The transport layer ensures the correct web page is delivered to the correct browser window. A corporate worker is accessing a web server located on a corporate network. The transport layer formats the screen so the web page appears properly no matter what device is being used to view the web site. - ANSWER A student has two web browser windows open in order to access two web sites. The transport layer ensures the correct web page is delivered to the correct browser window. A user opens three browsers on the same PC to access to search for certification course information. The Cisco web server sends a datagram as a reply to the request from one of the web browsers. Which information is used by the TCP/IP protocol stack in the PC to identify which of the three web browsers should receive the reply? the destination IP address the destination port number the source IP address the source port number - ANSWER the destination port number What are two ways that TCP uses the sequence numbers in a segment? (Choose two.) to identify missing segments at the destination to reassemble the segments at the remote location to specify the order in which the segments travel from source to destination to limit the number of segments that can be sent out of an interface at one time to determine if the packet changed during transit - ANSWER to identify missing segments at the destination to reassemble the segments at the remote location Which two tasks are functions of the presentation layer? (Choose two.) compression addressing encryption session control authentication - ANSWER compression encryption What is a key characteristic of the peer-to-peer networking model? wireless networking social networking without the Internet network printing using a print server resource sharing without a dedicated server - ANSWER resource sharing without a dedicated server A technician can ping the IP address of the web server of a remote company but cannot successfully ping the URL address of the same web server. Which software utility can the technician use to diagnose the problem? tracert ipconfig netstat nslookup - ANSWER nslookup Which domain name would be an example of a top-level domain? .com - ANSWER .com A PC obtains its IP address from a DHCP server. If the PC is taken off the network for repair, what happens to the IP address configuration? The configuration is permanent and nothing changes. The address lease is automatically renewed until the PC is returned. The address is returned to the pool for reuse when the lease expires. The configuration is held by the server to be reissued when the PC is returned. - ANSWER The address is returned to the pool for reuse when the lease expires.