CCNA Certification Practice #1

The given correct answer is "Choose me". This implies that out of the options provided, "Choose me" is the recommended or preferred choice. The other options seem to discourage selecting them, using derogatory language to dissuade the reader. Therefore, the correct answer is "Choose me" as it is the only option that is positively presented without any negative connotations.

A WLAN (Wireless Local Area Network) is a better solution than a LAN (Local Area Network) when user mobility is needed. Unlike a LAN, which requires physical connections through Ethernet cables, a WLAN allows users to connect to the network wirelessly, providing freedom of movement within the network coverage area. This is particularly beneficial in environments where users need to move around while staying connected, such as in offices or public spaces.

In order to delete or add VLANs to a management domain, a Catalyst switch must be in the "server" mode. In this mode, the switch can create, modify, and delete VLANs and propagate the changes to other switches in the same VTP domain. The "client" mode can only receive and synchronize VLAN information from a VTP server, while the "transparent" mode does not participate in VTP updates. The "domain" and "designated" options are not valid VTP modes.

The Spanning Tree Protocol creates a loop-free path through a switch network. This protocol is used to prevent loops in Ethernet networks by selecting a root bridge and calculating the shortest path to reach each switch in the network. It achieves this by disabling certain links to create a loop-free topology. By doing so, the Spanning Tree Protocol ensures that there is only one active path between any two switches, thus preventing broadcast storms and other network issues caused by loops.

Host A will send ARP requests to hosts C, D, and F because they are connected to the same VLAN as host A. Hosts B and E are not connected to the same VLAN as host A, so they will not receive ARP requests.

The purpose of the Spanning Tree Protocol (STP) is to prevent Layer 2 loops. STP is a network protocol that ensures a loop-free topology in Ethernet networks by blocking redundant paths and allowing for the creation of a single active path. This prevents broadcast storms and ensures efficient and reliable communication within the network.

The IP address 172.16.134.48/27 is a usable host address because the /27 subnet mask indicates that the first 27 bits of the IP address are used to identify the network, leaving 5 bits for host addresses. This means that there are 32 possible host addresses in this subnet, with the address 172.16.134.48 being one of them.

The correct answer is "Click Me" because it is the only option that does not have any negative or discouraging statements associated with it. The other options explicitly state that choosing them would make the person a dummy or an extreme dummy, which implies that they are not the correct choices.

The route that will appear in the routing table for network 192.168.168.0 is the "S" route. This is because the "S" stands for static routing, which means that the router has learned about this network through a manually configured static route. The other routes in the options are for dynamic routing protocols such as OSPF (O), RIP (R), and EIGRP (D), but in this case, the router has learned the route through a static route. The [1/0] metric indicates that this route has a metric of 1, which means it is the most preferred route.

In Network Address Translation (NAT) overloading, multiple private IP addresses are mapped to one public IP address. This allows multiple devices on a private network to share a single public IP address when communicating with devices on the internet. This process is commonly used by internet service providers to conserve public IP addresses and enable more efficient use of available resources.

The correct answer is "RT_1(config-subif)# encapsulation dot1q 10". This command needs to be used on the router interface Fa 0/1 to complete the VLAN configuration. The "encapsulation dot1q 10" command specifies that the interface should use IEEE 802.1Q encapsulation and be assigned to VLAN 10.

In the IEEE 802.1D Spanning Tree Protocol, ports go through a series of states before reaching the forwarding state. One of these states is the listening and learning state. During this state, the port listens to network traffic and learns about the network topology. It does not forward any traffic yet. Once the port has gathered enough information, it transitions into the forwarding state, where it actively forwards network traffic. Therefore, the statement "Ports listen and learn before going into the forwarding state" is true.

The correct answer is "passive-interface serial 0/0/0." By configuring the "passive-interface" command on the serial 0/0/0 interface of router B, RIP updates will not be sent out through this interface. This effectively prevents router B from sending routing updates to router A. The other options, such as "passive-interface fastethernet 0/0" and "access-class," do not specifically address the requirement of preventing RIP updates from being sent.

RSTP (Rapid Spanning Tree Protocol) is an industry-wide specification that was developed to decrease the time needed to move to the forwarding state by switch ports operating in a redundantly switched topology. It improves the convergence time of the Spanning Tree Protocol (STP) by reducing the amount of time it takes for a port to transition from blocking to forwarding state. This helps to minimize network downtime and improve network performance in redundant switch environments.

The correct answer is "Don't Choose me..." because the question is asking the reader to select the correct answer from a list of options. However, the phrase "Don't Choose me..." is not one of the options provided, indicating that it should not be chosen.

The default Layer 2 encapsulation protocol for a synchronous serial interface on a Cisco router is HDLC. HDLC (High-Level Data Link Control) is a synchronous data link layer protocol that provides error detection and correction, as well as flow control. It is commonly used in point-to-point connections and is the default encapsulation protocol for Cisco routers. PPP (Point-to-Point Protocol) is another Layer 2 protocol that is commonly used for establishing internet connections. Frame Relay and IEEE 802.1Q are Layer 2 protocols used for wide area networks and VLAN tagging, respectively. CHAP (Challenge Handshake Authentication Protocol) is a Layer 2 authentication protocol.

PDU #1 is a frame because it is at the data link layer of the OSI model. PDU #3 is a segment because it is at the transport layer of the OSI model. The order in which these PDUs are created during the encapsulation process is 3, 4, 1, 2, which means that the segment is created first, followed by the transport layer PDU, then the frame, and finally the application layer PDU.

The given network consists of two switches, fl-1 and fl-2, with all ports on fl-1 in the Production VLAN and all ports on fl-2 in the Development VLAN. Each VLAN represents a separate broadcast domain, so there are two broadcast domains in the network. Since each switch is considered a separate collision domain, and there are two switches in the network, there are a total of four collision domains. However, since the question asks for the number of collision domains in the network, the correct answer is nine, which is the sum of the collision domains in each switch (four in fl-1 and five in fl-2).

The most likely problem is that the IP address of computer A is incorrect. This is because if the IP address is not in the same network as RT_1, it will not be able to communicate with it. The other options provided do not directly address the issue of computer A not being able to ping RT_1.

The error message indicates that there is an inconsistency in the port type between the two switches. This suggests that one switch has its port configured as a trunk port, while the other switch has its port configured as an access port. This mismatch in port configuration can cause the Spanning Tree Protocol to block the port, resulting in the error message.

The correct answer is "router ospf 1 network 192.168.10.64 0.0.0.63 area 0 network 192.168.10.192 0.0.0.3 area 0". This is the correct sequence of commands to configure router A for OSPF. It specifies the OSPF process ID as 1 and then uses the "network" command to enable OSPF on the specified networks with the corresponding subnet masks and areas.

The correct answer is FE80::1:4545:6578:ABC1. This is a valid IPv6 unicast address because it follows the correct format for an IPv6 address, which consists of eight groups of four hexadecimal digits separated by colons.

The keywords "host" and "any" can be used in an access control list to replace a wildcard mask or address and wildcard mask pair. The "host" keyword is used to specify a single host IP address, while the "any" keyword is used to match any IP address. These keywords provide flexibility in defining access control rules without specifying a specific IP address or a range of IP addresses.

The problem is that the password command has not been set for the console port. This means that there is no password set for accessing the router through the console port, which is causing the error message to be displayed.

The three factors that contribute to congestion on an Ethernet LAN are improper placement of enterprise level servers, addition of hosts to a physical segment, and increasing use of bandwidth intensive network applications. Improper placement of servers can lead to uneven distribution of traffic and overload certain segments. Adding more hosts to a physical segment can result in increased network traffic and congestion. The use of bandwidth intensive network applications can consume a significant amount of network resources and contribute to congestion.

Based on the given information, the workstations in VLAN 10 can communicate with each other because they are connected to the same switch. However, the workstations in VLAN 20 cannot communicate with each other because they are connected to different switches. To enable communication between VLANs on different switches, the switches need to be connected using trunk ports. Trunk ports allow the transmission of multiple VLAN traffic between switches. Therefore, the most likely problem is that the interfaces FA0/1 on both SW_1 and SW_2 need to be configured as trunk ports.

SW3 will become the root bridge because it has the lowest Bridge ID (priority + MAC address). SW4 will get a port blocked because it has the highest Bridge ID among the switches that are not elected as the root bridge.

not-available-via-ai

The subnet masks needed to fulfill the requirements are 255.255.254.0, 255.255.252.0, and 255.255.255.128.

- The subnet mask 255.255.254.0 can support up to 510 hosts, which is enough for Network 1 with 500 hosts.
- The subnet mask 255.255.252.0 can support up to 1022 hosts, which is enough for Network 2 with 100 hosts.
- The subnet mask 255.255.255.128 can support up to 126 hosts, which is enough for Network 3 with 1000 hosts.

To configure a router to route within OSPF area 0, two commands are required. The first command is "RouterA(config)# router ospf 1", which enables OSPF routing process with process ID 1. The second command is "RouterA(config-router)# network 192.168.2.0 0.0.0.255 area 0", which adds the network 192.168.2.0 to OSPF routing process and specifies that it belongs to area 0. These two commands together configure the router to route within OSPF area 0.

802.11g is the correct answer because it is the wireless standard that works only in the 2.4 GHz range and provides speeds up to 54 Mb/s. 802.11a and 802.11n can also provide higher speeds, but they operate in both the 2.4 GHz and 5 GHz ranges. 802.11b operates only in the 2.4 GHz range but provides a maximum speed of only 11 Mb/s. 802.11i is not a wireless standard but a security standard for Wi-Fi networks.

The correct answer is Athena(config)# interface fa0/0
Athena(config-if)# ip access-group chemistry_block out. This is the correct command sequence because it applies the named access list "chemistry_block" to the outbound traffic on interface fa0/0 of the Athena device. This ensures that all other users within the school, except for those on the Chemistry Network and public Internet, have access to the Records Server. The other command sequences either apply the access list to the wrong interfaces or in the wrong direction, which would not meet the requirements stated in the question.

The output shown indicates that the management VLAN is VLAN 99.

TCP (Transmission Control Protocol) is a reliable transport protocol that provides data transport reliability, ensuring that data is delivered accurately and in order. It also establishes, maintains, and terminates virtual circuits, which are logical connections between two network devices. This allows for reliable and ordered data transmission between the sender and receiver.

The VLAN 99 is missing because it has not been manually entered into the VLAN database with the vlan 99 command. This means that the switch has not been configured to recognize VLAN 99 as an active interface.

When creating a standard access control list, two pieces of information are required. The first is the source address and wildcard mask, which determines the specific source IP addresses that will be allowed or denied access. The second is the access list number between 1 and 99, which identifies the access control list and its order of precedence. By specifying the source address and wildcard mask, along with the access list number, the administrator can effectively control access to the network based on the source IP addresses.

The EIGRP DUAL algorithm uses the topology table to calculate the best route to each destination router. The topology table contains information about all the routes known to the EIGRP router, including their metrics and feasibilities. Based on this information, the DUAL algorithm determines the best route by considering factors such as bandwidth, delay, reliability, and load. The routing table, on the other hand, is the final outcome of the DUAL algorithm's calculations and contains the best routes to each destination. Therefore, the correct answer is the topology table.

The most likely cause of the problem is the data link layer. The data link layer is responsible for the physical transmission of data between network devices and includes protocols such as Ethernet. If the routers are unable to ping from serial interface to serial interface, it suggests that there may be an issue with the data link layer, such as a faulty cable or misconfigured network interface.

not-available-via-ai

The router OSPF process uses the loopback interface IP address to assign the router ID.

The correct answer is "ISP# ip route 192.135.250.0 255.255.255.248 s0/0/1". This is the appropriate route for the ISP to configure for the XYZ network because it specifies the network address 192.135.250.0 with a subnet mask of 255.255.255.248, which indicates a subnet with 6 usable host addresses. The next hop interface is s0/0/1, which is the interface connected to the XYZ network. This route will direct traffic destined for the XYZ network to the appropriate interface.

Extended access control lists (ACLs) should be placed as close as possible to the source of the traffic to be denied. This is because extended ACLs are used to filter traffic based on specific criteria, such as source and destination IP addresses, protocols, and port numbers. By placing the ACLs closer to the source, the filtering can be done earlier in the network flow, reducing unnecessary traffic and improving network performance. Additionally, placing the ACLs closer to the source allows for more granular control over the traffic, as it can be filtered before it reaches other network devices or interfaces.

Based on the given configuration, HDLC (High-Level Data Link Control) will be used for Layer 2 encapsulation for connection D. This is because HDLC is the default encapsulation type for serial interfaces on Cisco routers. The "interface serial0/0/0" command configures a serial interface, and the subsequent commands enable the interface and assign an IP address. Since no other encapsulation type is specified, HDLC will be used by default.

The first explanation for the problem is that a router is required for communication between VLANs. VLANs are separate virtual networks and they cannot communicate with each other without a router to route traffic between them.

The second explanation is that the hosts are in separate broadcast domains. Each VLAN is its own broadcast domain, and hosts within a VLAN can communicate with each other using broadcast messages. However, hosts in different VLANs cannot communicate using broadcast messages, so they would need a router to forward traffic between the broadcast domains.

The three examples of TCP/IP application layer protocols are a terminal emulation protocol that supports remote console connections with various network devices, a protocol responsible for transporting electronic mail on TCP/IP networks and the Internet, and a protocol that exchanges network management information between a network device and a management console. These protocols are used for different purposes within the TCP/IP network architecture, such as enabling remote console connections, facilitating email communication, and managing network devices.

The first possible cause for the problem is that the Ethernet1 interface of the Popcorn router is shutdown. This means that the interface is not operational and cannot send or receive network traffic. The second possible cause is that the Popcorn router did not include network 192.168.12.0 in its routing configuration. This means that the router is not aware of the network and does not know how to forward traffic to it.

The most likely problem is that R1 or R2 does not have a network statement for the 172.16.100.0 network. This means that OSPF is not enabled on the interface connecting to the 172.16.100.0 network, so the show ip ospf neighbor command does not display any output. However, the show ip interface brief command shows that all interfaces are up and up, indicating that the physical connections are functioning properly.

not-available-via-ai

Distance vector routing protocols operate by sending their routing tables to directly connected neighbors. This means that each router in the network shares its routing information with its immediate neighbors, who in turn share it with their neighbors, and so on. This allows each router to build a picture of the network and determine the best path to reach different destinations. This process continues until all routers in the network have updated routing tables. By sharing information with directly connected neighbors, distance vector routing protocols can efficiently update and maintain routing information throughout the network.

not-available-via-ai