{"id":14543,"date":"2026-09-17T05:35:22","date_gmt":"2026-09-17T05:35:22","guid":{"rendered":"https:\/\/www.examlabs.com\/certification\/?p=14543"},"modified":"2026-09-17T05:35:22","modified_gmt":"2026-09-17T05:35:22","slug":"cisco-100-150-practice-test-questions-and-exam-dumps-part1-q1-20","status":"publish","type":"post","link":"https:\/\/www.examlabs.com\/certification\/cisco-100-150-practice-test-questions-and-exam-dumps-part1-q1-20\/","title":{"rendered":"Cisco 100-150 Practice Test Questions and Exam Dumps Part1 Q1-20"},"content":{"rendered":"

<\/h1>\n

View Full <\/b>Cisco 100-150 Exam Dumps<\/b><\/a> and Practice Test Dumps.<\/b><\/h2>\n

 <\/p>\n

Question 1<\/b><\/h3>\n

What is the primary function of a router?<\/b><\/p>\n

    \n
  1. Forwarding data packets between computer networks.<\/span><\/li>\n
  2. Connecting devices within a single local area network exclusively.<\/span><\/li>\n
  3. Amplifying weak electrical signals on a coaxial cable.<\/span><\/li>\n
  4. Assigning static IP addresses to end user workstations.<\/span><\/li>\n<\/ol>\n

    Correct Answer: 1<\/b><\/p>\n

    Explanation:<\/b><\/p>\n

    A router is a specialized networking device operating at Layer 3 of the OSI model, which is the network layer. Its core responsibility is to examine incoming data packets, determine the optimal destination path using routing tables and routing protocols, and forward those packets toward their destination across interconnected networks. Unlike switches that operate within a single local area network to connect devices using MAC addresses, routers bridge disparate networks together, manage traffic routing decisions, and implement firewall or security policies at network boundaries to ensure efficient and secure enterprise communications.<\/span><\/p>\n

    Question 2<\/b><\/h3>\n

    Which OSI layer is responsible for reliable end-to-end data delivery?<\/b><\/p>\n

      \n
    1. Physical layer.<\/span><\/li>\n
    2. Data Link layer.<\/span><\/li>\n
    3. Transport layer.<\/span><\/li>\n
    4. Application layer.<\/span><\/li>\n<\/ol>\n

      Correct Answer: 3<\/b><\/p>\n

      Explanation:<\/b><\/p>\n

      The Transport layer, which is Layer 4 of the OSI reference model, is fundamentally responsible for providing reliable, transparent, and error-checked end-to-end data delivery between communicating hosts. Protocols operating at this layer, such as Transmission Control Protocol, establish connection-oriented sessions, implement flow control mechanisms, utilize windowing to optimize bandwidth utilization, and perform error detection and retransmission of lost segments. This ensures that application data streams are delivered accurately, in correct sequence, and without corruption regardless of the underlying physical network infrastructure traversed.<\/span><\/p>\n

      Question 3<\/b><\/h3>\n

      What is the default subnet mask for a Class C IP address?<\/b><\/p>\n

        \n
      1. 255.0.0.0<\/span><\/li>\n
      2. 255.255.0.0<\/span><\/li>\n
      3. 255.255.255.0<\/span><\/li>\n
      4. 255.255.255.255<\/span><\/li>\n<\/ol>\n

        Correct Answer: 3<\/b><\/p>\n

        Explanation:<\/b><\/p>\n

        In traditional classful IPv4 addressing, Class C networks are designated for small-scale networks and utilize a default subnet mask of 255.255.255.0. In binary representation, this corresponds to twenty-four network bits followed by eight host bits. This mask indicates that the first three octets of the IP address identify the specific network segment, while the final octet is available for host device identification. This configuration allows a maximum of 254 usable host IP addresses per network segment after reserving the network identifier and broadcast addresses.<\/span><\/p>\n

        Question 4<\/b><\/h3>\n

        Which device operates primarily at Layer 2 of the OSI model?<\/b><\/p>\n

          \n
        1. Hub.<\/span><\/li>\n
        2. Layer 2 Switch.<\/span><\/li>\n
        3. Router.<\/span><\/li>\n
        4. Application Firewall.<\/span><\/li>\n<\/ol>\n

          Correct Answer: 2<\/b><\/p>\n

          Explanation:<\/b><\/p>\n

          A Layer 2 switch operates at the Data Link layer of the OSI model and makes forwarding decisions based exclusively on hardware Media Access Control addresses embedded within Ethernet frames. When a frame enters a switch port, the device examines the source MAC address and records it in its Content Addressable Memory table to map port locations. It then looks up the destination MAC address to forward the frame only to the specific port connected to the target device, thereby reducing unnecessary network traffic and minimizing collision domains across the local network infrastructure.<\/span><\/p>\n

          Question 5<\/b><\/h3>\n

          What is the primary purpose of the Address Resolution Protocol?<\/b><\/p>\n

            \n
          1. Translating domain names into numerical IP addresses.<\/span><\/li>\n
          2. Mapping known Layer 3 IPv4 addresses to physical Layer 2 MAC addresses.<\/span><\/li>\n
          3. Dynamically assigning configuration parameters to client workstations.<\/span><\/li>\n
          4. Encrypting payload data across insecure wireless connections.<\/span><\/li>\n<\/ol>\n

            Correct Answer: 2<\/b><\/p>\n

            Explanation:<\/b><\/p>\n

            The Address Resolution Protocol is a critical networking protocol utilized within IPv4 networks to resolve logical network layer addresses into physical hardware addresses. When a host needs to communicate with another device on the same local network segment, it knows the destination IP address but requires the corresponding hardware MAC address to construct a valid Ethernet frame. The sending host broadcasts an ARP request packet asking the owner of the target IP address to reply with its MAC address, enabling successful frame encapsulation and transmission.<\/span><\/p>\n

            Question 6<\/b><\/h3>\n

            Which cable type is most susceptible to electromagnetic interference?<\/b><\/p>\n

              \n
            1. Shielded Twisted Pair.<\/span><\/li>\n
            2. Unshielded Twisted Pair.<\/span><\/li>\n
            3. Single-mode Fiber Optic.<\/span><\/li>\n
            4. Multi-mode Fiber Optic.<\/span><\/li>\n<\/ol>\n

              Correct Answer: 2<\/b><\/p>\n

              Explanation:<\/b><\/p>\n

              Unshielded Twisted Pair copper cabling lacks metallic shielding foil or braided screening around its internal wire pairs. Consequently, UTP cables are highly vulnerable to external electromagnetic interference and radio frequency interference generated by nearby electrical equipment, fluorescent lighting ballasts, and high-voltage power lines. While twisting the wire pairs helps cancel out differential mode noise through electromagnetic cancellation, environments with severe electrical noise require shielded twisted pair or fiber optic cabling, which transmits pulses of light and is entirely immune to electromagnetic interference.<\/span><\/p>\n

              Question 7<\/b><\/h3>\n

              What is the decimal equivalent of the binary octet 11000000?<\/b><\/p>\n

                \n
              1. 128<\/span><\/li>\n
              2. 192<\/span><\/li>\n
              3. 224<\/span><\/li>\n
              4. 240<\/span><\/li>\n<\/ol>\n

                Correct Answer: 2<\/b><\/p>\n

                Explanation:<\/b><\/p>\n

                To convert the binary octet 11000000 to decimal, calculate the sum of the powers of two corresponding to each bit position containing a binary one, moving from right to left starting at two to the power of zero. The left-most bit represents 128, and the second bit from the left represents 64. Adding 128 and 64 together yields a total decimal value of 192. The remaining six bits are zeros and contribute nothing to the final sum, making 192 a foundational value frequently used in IPv4 subnetting and network masking.<\/span><\/p>\n

                Question 8<\/b><\/h3>\n

                Which IEEE standard defines standard Ethernet over twisted pair cabling?<\/b><\/p>\n

                  \n
                1. IEEE 802.3<\/span><\/li>\n
                2. IEEE 802.11<\/span><\/li>\n
                3. IEEE 802.1Q<\/span><\/li>\n
                4. IEEE 802.1X<\/span><\/li>\n<\/ol>\n

                  Correct Answer: 1<\/b><\/p>\n

                  Explanation:<\/b><\/p>\n

                  The IEEE 802.3 standard family defines the physical layer and data link layer media access control specifications for wired Ethernet local area networks. Over decades of evolution, 802.3 has expanded from early coaxial implementations to encompass twisted pair copper cabling standards such as 10BASE-T, 100BASE-TX, and 1000BASE-T, as well as various optical fiber standards. In contrast, IEEE 802.11 governs wireless local area networks, IEEE 802.1Q specifies Virtual Local Area Network tagging on Ethernet frames, and IEEE 802.1X provides port-based network access control authentication mechanisms.<\/span><\/p>\n

                  Question 9<\/b><\/h3>\n

                  What is the primary function of the Dynamic Host Configuration Protocol?<\/b><\/p>\n

                    \n
                  1. Resolving fully qualified domain names into IP addresses.<\/span><\/li>\n
                  2. Automating the assignment of IP addresses and configuration parameters to hosts.<\/span><\/li>\n
                  3. Translating private internal IP addresses into public routable IP addresses.<\/span><\/li>\n
                  4. Monitoring network device CPU utilization and interface error rates.<\/span><\/li>\n<\/ol>\n

                    Correct Answer: 2<\/b><\/p>\n

                    Explanation:<\/b><\/p>\n

                    The Dynamic Host Configuration Protocol is a network management protocol used to automate the configuration of devices connected to an IP network. Instead of manually assigning static IP addresses, subnet masks, default gateways, and DNS server addresses to every individual workstation, a DHCP server leases these configuration parameters dynamically from a predefined address pool. This eliminates manual configuration errors, optimizes IP address utilization through temporary lease expirations, and simplifies network administration across enterprise environments.<\/span><\/p>\n

                    Question 10<\/b><\/h3>\n

                    Which switching method checks the destination address before forwarding a frame?<\/b><\/p>\n

                      \n
                    1. Cut-through switching.<\/span><\/li>\n
                    2. Fragment-free switching.<\/span><\/li>\n
                    3. Store-and-forward switching.<\/span><\/li>\n
                    4. Direct-access switching.<\/span><\/li>\n<\/ol>\n

                      Correct Answer: 3<\/b><\/p>\n

                      Explanation:<\/b><\/p>\n

                      In store-and-forward switching, the switch receives the entire Ethernet frame into its internal memory buffer before taking any forwarding action. Once the complete frame is received, the switch performs a Cyclic Redundancy Check to verify frame integrity, checking for mathematical errors and runt frames. Only if the frame passes validation does the switch examine the destination MAC address, look up the routing table, and forward the frame out the appropriate egress port. This method ensures error-free transmission but introduces slightly higher latency than cut-through methods.<\/span><\/p>\n

                      Question 11<\/b><\/h3>\n

                      What is the broadcast address for a subnet with IP 192.168.1.0 and mask 255.255.255.0?<\/b><\/p>\n

                        \n
                      1. 192.168.1.0<\/span><\/li>\n
                      2. 192.168.1.1<\/span><\/li>\n
                      3. 192.168.1.254<\/span><\/li>\n
                      4. 192.168.1.255<\/span><\/li>\n<\/ol>\n

                        Correct Answer: 4<\/b><\/p>\n

                        Explanation:<\/b><\/p>\n

                        In any standard IPv4 subnet, the network identifier is represented by setting all host bits to zero, while the broadcast address is represented by setting all host bits to binary ones. For the network 192.168.1.0 with a subnet mask of 255.255.255.0, the first three octets represent the network portion and remain fixed. The final octet represents the host portion, which contains eight bits. Setting all eight host bits to binary ones results in decimal 255, establishing 192.168.1.255 as the broadcast address utilized to reach all devices on that specific subnet.<\/span><\/p>\n

                        Question 12<\/b><\/h3>\n

                        Which protocol operates at the Transport layer using connectionless datagram delivery?<\/b><\/p>\n

                          \n
                        1. Transmission Control Protocol.<\/span><\/li>\n
                        2. User Datagram Protocol.<\/span><\/li>\n
                        3. Internet Protocol.<\/span><\/li>\n
                        4. File Transfer Protocol.<\/span><\/li>\n<\/ol>\n

                          Correct Answer: 2<\/b><\/p>\n

                          Explanation:<\/b><\/p>\n

                          The User Datagram Protocol is a core transport layer protocol that provides a simple, connectionless communication service without flow control, error recovery, or packet retransmission guarantees. Unlike Transmission Control Protocol, which establishes a formal handshake and tracks sequence numbers for reliable delivery, UDP transmits datagrams immediately without verifying receiver availability or acknowledgment. This makes UDP ideal for real-time applications such as Voice over IP, video streaming, and online gaming, where low latency is critical and occasional lost packets are preferable to transmission delays.<\/span><\/p>\n

                          Question 13<\/b><\/h3>\n

                          What is the main purpose of Network Address Translation?<\/b><\/p>\n

                            \n
                          1. Translating private unregistered IP addresses into public registered IP addresses.<\/span><\/li>\n
                          2. Encrypting network layer packets across public untrusted transmission media.<\/span><\/li>\n
                          3. Automatically assigning dynamic hostnames to local network workstations.<\/span><\/li>\n
                          4. Prioritizing voice and video traffic over background data file transfers.<\/span><\/li>\n<\/ol>\n

                            Correct Answer: 1<\/b><\/p>\n

                            Explanation:<\/b><\/p>\n

                            Network Address Translation is a technique used primarily to conserve IPv4 address space by mapping an entire local network of private, non-routable IP addresses onto a single public, routable IP address provided by an Internet Service Provider. As internal packets traverse the NAT router heading outward to the public internet, source IP headers are modified to display the public address. When return traffic arrives, the router translates the public destination back to the appropriate internal private IP address, maintaining session state integrity and enhancing internal network security.<\/span><\/p>\n

                            Question 14<\/b><\/h3>\n

                            Which TCP flag is used to initiate a connection handshake?<\/b><\/p>\n

                              \n
                            1. ACK<\/span><\/li>\n
                            2. FIN<\/span><\/li>\n
                            3. SYN<\/span><\/li>\n
                            4. RST<\/span><\/li>\n<\/ol>\n

                              Correct Answer: 3<\/b><\/p>\n

                              Explanation:<\/b><\/p>\n

                              The Synchronize flag is utilized during the initial phase of the Transmission Control Protocol three-way handshake to establish a reliable connection between two network hosts. The connection sequence begins when the client sends a segment containing the SYN flag and an initial sequence number to the server. The server responds with a SYN-ACK segment acknowledging the request and providing its own sequence number. Finally, the client replies with an ACK packet, confirming receipt and completing the handshake so data transmission can commence securely.<\/span><\/p>\n

                              Question 15<\/b><\/h3>\n

                              What is the primary function of a VLAN?<\/b><\/p>\n

                                \n
                              1. Extending physical broadcast domains across multiple remote WAN links.<\/span><\/li>\n
                              2. Logically segmenting a physical local area network into multiple distinct broadcast domains.<\/span><\/li>\n
                              3. Encrypting wireless data frames against unauthorized third-party eavesdropping.<\/span><\/li>\n
                              4. Providing physical port redundancy between core aggregation switches.<\/span><\/li>\n<\/ol>\n

                                Correct Answer: 2<\/b><\/p>\n

                                Explanation:<\/b><\/p>\n

                                A Virtual Local Area Network is a logical partitioning of a physical switched network into multiple distinct broadcast domains. By grouping ports and devices logically regardless of their physical wiring location in the building, network administrators can isolate traffic, enhance security, and improve overall network performance. Broadcast traffic generated by devices on one VLAN remains confined to that specific VLAN and cannot cross over to other VLANs without being routed by an intervening Layer 3 router or multilayer switch.<\/span><\/p>\n

                                Question 16<\/b><\/h3>\n

                                Which device is used to connect multiple network segments while operating at Layer 1?<\/b><\/p>\n

                                  \n
                                1. Router.<\/span><\/li>\n
                                2. Layer 2 Switch.<\/span><\/li>\n
                                3. Hub.<\/span><\/li>\n
                                4. Bridge.<\/span><\/li>\n<\/ol>\n

                                  Correct Answer: 3<\/b><\/p>\n

                                  Explanation:<\/b><\/p>\n

                                  A network hub operates strictly at Layer 1, the physical layer of the OSI model. When a hub receives an electrical or optical signal on one of its ports, it simply regenerates that signal and broadcasts it out all other active ports without examining header information, MAC addresses, or packet contents. Because hubs do not filter traffic or establish separate collision domains, all connected devices share a single collision domain and a single broadcast domain, leading to increased contention and potential performance degradation in busy networks.<\/span><\/p>\n

                                  Question 17<\/b><\/h3>\n

                                  What is the CIDR notation for the subnet mask 255.255.255.192?<\/b><\/p>\n

                                    \n
                                  1. \/24<\/span><\/li>\n
                                  2. \/25<\/span><\/li>\n
                                  3. \/26<\/span><\/li>\n
                                  4. \/27<\/span><\/li>\n<\/ol>\n

                                    Correct Answer: 3<\/b><\/p>\n

                                    Explanation:<\/b><\/p>\n

                                    CIDR notation represents the number of continuous network bits set to binary one within an IPv4 subnet mask. To determine the CIDR prefix for 255.255.255.192, evaluate the final octet 192 in binary form, which is 11000000. This octet contains two bits set to one and six bits set to zero. The first three octets equal twenty-four network bits. Adding the two bits from the final octet gives a total of twenty-six network bits, resulting in a \/26 prefix notation, which provides sixty-four total IP addresses per subnet.<\/span><\/p>\n

                                    Question 18<\/b><\/h3>\n

                                    Which protocol is used to securely manage network devices via encrypted command line sessions?<\/b><\/p>\n

                                      \n
                                    1. Telnet.<\/span><\/li>\n
                                    2. HTTP.<\/span><\/li>\n
                                    3. SSH.<\/span><\/li>\n
                                    4. SNMP.<\/span><\/li>\n<\/ol>\n

                                      Correct Answer: 3<\/b><\/p>\n

                                      Explanation:<\/b><\/p>\n

                                      Secure Shell is a cryptographic network protocol designed for operating network services securely over an unsecured network. In enterprise networking environments, SSH is used as a secure replacement for legacy Telnet sessions when administrators remotely log into routers, switches, and firewalls to execute command line configurations. Unlike Telnet, which transmits all authentication credentials, usernames, passwords, and command keystrokes in plain text across the network where they can be easily intercepted, SSH encrypts all transmitted data streams to prevent unauthorized eavesdropping.<\/span><\/p>\n

                                      Question 19<\/b><\/h3>\n

                                      What is the primary purpose of spanning tree protocol in switched networks?<\/b><\/p>\n

                                        \n
                                      1. Increasing available link bandwidth by bundling multiple physical cables together.<\/span><\/li>\n
                                      2. Preventing network looping by dynamically blocking redundant paths in a topology.<\/span><\/li>\n
                                      3. Automatically assigning IP addresses to client workstations connecting to switch ports.<\/span><\/li>\n
                                      4. Translating private IP addresses into public routable internet addresses.<\/span><\/li>\n<\/ol>\n

                                        Correct Answer: 2<\/b><\/p>\n

                                        Explanation:<\/b><\/p>\n

                                        Spanning Tree Protocol is a Layer 2 loop-prevention mechanism designed to ensure a loop-free logical topology across redundant physical switch links. In enterprise networks, redundant links are frequently deployed to guarantee high availability; however, unmanaged loops can cause broadcast storms, multiple frame copies, and catastrophic MAC table instability. STP calculates an optimal loop-free path across the bridged network, automatically placing redundant ports into a blocking state so they can instantly transition to a forwarding state if a primary link failure occurs.<\/span><\/p>\n

                                        Question 20<\/b><\/h3>\n

                                        Which IPv6 address type is used for communication within a single local link only?<\/b><\/p>\n

                                          \n
                                        1. Global Unicast Address.<\/span><\/li>\n
                                        2. Unique Local Address.<\/span><\/li>\n
                                        3. Link-Local Address.<\/span><\/li>\n
                                        4. Anycast Address.<\/span><\/li>\n<\/ol>\n

                                          Correct Answer: 3<\/b><\/p>\n

                                          Explanation:<\/b><\/p>\n

                                          An IPv6 Link-Local Address is automatically configured on all IPv6-enabled interfaces as soon as the protocol is initialized, using the reserved prefix fe80::\/10. Link-local addresses are strictly non-routable, meaning routers will never forward packets containing link-local source or destination addresses outside the local network segment. These addresses are essential for fundamental neighbor discovery, router solicitation, and basic local communication between neighboring nodes on the exact same physical or logical link before global or unique local addressing is established.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

                                          View Full Cisco 100-150 Exam Dumps and Practice Test Dumps.   Question 1 What is the primary function of a router? Forwarding data packets between computer networks. Connecting devices within a single local area network exclusively. Amplifying weak electrical signals on a coaxial cable. Assigning static IP addresses to end user workstations. Correct Answer: 1 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1648,1647],"tags":[],"_links":{"self":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/14543"}],"collection":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/comments?post=14543"}],"version-history":[{"count":1,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/14543\/revisions"}],"predecessor-version":[{"id":14582,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/posts\/14543\/revisions\/14582"}],"wp:attachment":[{"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/media?parent=14543"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/categories?post=14543"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.examlabs.com\/certification\/wp-json\/wp\/v2\/tags?post=14543"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}