CCNA practice test questions

What are three statements about the traceroute command?

1. It is used to determine the network points where packets are getting dropped. 2. It finds the path a packet takes while it is transmitted to a remote destination 3. It records the source of each ICMP "time exceeded" message to provide a trace of the path.

192.168.10.4 The router will direct the packets to 192.168.10.4 as the Next Hop Router

You have enabled various routing protocols on the network router. The exhibit shows a partial output of the show ip route command. Which route will be used to forward an IP packet with a destination address of 172.16.20.3?

You need to implement a new Quality of Service (QoS) policy and examine the existing network. What is the recommended one-way delay value for voice services in an IP network?

150 ms There are some recommended values for achieving high sound and video quality. You should use the following guideline for voice services: Delay (one-way): 150 ms Jitter: 30 ms Loss: 1% For video services, you should use the following values as a guideline: Delay (one-way): 200-400 ms Jitter: 30-50 ms Loss: less than 1% Bandwidth: 384 Kbps

What is the multicast address associated with RIPv2

224.0.0.9

What is the show command to view the uptime of a switch?

Command: show version You can use this command to learn more about hardware and software, for example: Licenses Platform type Interfaces Active IOS Memory information Registry values Reload reason You could use a Simple Network Management Protocol (SNMP) server to monitor uptime values for a network device.

What is the show command to view the active IOS software integrity?

Command: show version verify /md5 flash:c860vae-ipbasek9-mz.152-4.M5.bin first do show flash: or show version to get the active IOS running on the device look for the .bin extension then run verify /md5 flash:c860vae-ipbasek9-mz.152-4.M5.bin Remember the IOS is located in flash, not NVRAM

You manage a network that has cisco switches. A new server is installed to centralize network management notification collections. You configure the switches to send SNMP notifications to this server. You need to configure the switches so that they can easily be identified from the server. What should you do?

Configure the engine ID The engine ID allows you to easily identify the switch based on the ID that you configure. It is also required to use SNMP v3 traps.

The show ip route command is used to display?

The route table information for a remote network.

The switch will flood the frame. If there are no entries in the CAM table, a switch sends this frame out to all interfaces, except the one it received it from. Switches learn MAC address to avoid flooding the network.

What will a switch do when it receives a frame with a destination MAC address that does not exist in the Content Addressable Memory (CAM) table?

Multicast Multicast is the IPv6 addressing method that represents communication between a single host and multiple receivers.

Which IPv6 addressing method represents communication between a single host and multiple receivers?

Hello/Dead interval Authentication Data Area ID

Which components contained in OSPF Hello packets must be consistent between all OSPF routers so that neighbor adjacencies can be properly established?

Router ID

Which feature is required for an EIGRP process to start and form neighbors on a cisco router in an IPv6 network?

If R1 is running OSPF, the path will be R1-R2-R3-R4-R5-R6 If R1 is running RIP, the path will be R1-R6-R7

Which path will R1 take to reach network 1.1.1.0 as shown in the exhibit

Open Shortest Path First (OSPF) supports plain text authentication Open Shortest Path First (OSPF) supports Message Digest 5 (MD5) authentication Enhanced Interior Gateway Routing Protocol (EIGRP) supports Message Digest 5 (MD5) authentication

Which three statements about routing protocol neighbor authentication on cisco routers are correct?

Telnet and SSH The both remotely connect to network devices using their Layer 3 IP address.

Which two network utilities are often used to access and configure a remote cisco device that is configured with an IP address?

The remote AS number is 10000 Two routes have been received from the neighbor

Which two statements are true regarding the partial output of the show ip bgp summary command on R1 shown in the exhibit?

Interior gateway protocols are responsible for routing within an autonomous system. Exterior gateway protocols are used by organizations that have more than one internet provider for load balancing and redundancy

Which two statements describe the main differences between interior and exterior gateway protocols?

From both switches, run the switchport access vlan 1 command on port 0/3

You are creating a network with the topology shown in the exhibit. The relevant portion of the show running-config command from both switches is also shown in the exhibit. You attempt to create an etherchannel using all three links, but it fails. you need to ensure that you can create the etherchannel link. What should you do?

Host A will not be able to communicate with any of the other hosts. Host B will only be able to communicate with Host C

You are the network admin for a company. You have divided the network into two seperate subnets and connected these subnets using a router. The exhibit shows a partial view of the network. Which two statements are true in the given scenario?

192.168.32.30 192.168.32.17

You are the network admin for your company. You need to assign IP addresses to hosts on the network having a subnet 192.168.32.16/28 Which two IP addresses can be assigned to the hosts?

Two straight-through cables and one crossover cable. You use straight-through cables to connect a router to a switch. You use crossover cables to connect a router to another router if you are using ethernet ports A rollover cable is used to connect the console port of the router to a serial port of a PC for managing the router.

You are troubleshooting a network communication issue with a router on the network. The router in question should be directly connected to another router and to two new switches on the network. You want to ensure the communication issue is not related to physical cabling between the devices. What are the different types of cables required?

Excessive late collisions Duplex mismatch A high number of late collisions is usually caused by a duplex mismatch and occur on the end of the connection that is running in half- duplex mode, or when there is an excessively long cable run connecting to the interface.

You are troubleshooting some connectivity issues on Core_Sw_A when you notice the output from the show interface command on GigabitEthernet 1/1 that is show in the exhibit. What type of problem does this output typically indicate and what is the likely cause of it?

Change the mode on SW1 to desirable The switches have been configured using Port Aggregation Protocol (PAgP). The mode is auto on both ends. You should change one end to the desireable mode to enable PAgP unconditionally

You have configured an EtherChannel between switches SW1 and SW2. The EtherChannel is down. Refer to the partial output of the show-running config of both switches below: SW1: interface FastEthernet0/23 switchport mode trunk channel-group 1 mode auto interface FastEthernet0/24 switchport mode trunk channel-group 1 mode auto SW2: interface FastEthernet0/23 switchport mode trunk channel-group 4 mode auto interface FastEthernet0/24 switchport mode trunk channel-group 4 mode auto What should you do to fix the problem?

both ends are configured in dynamic auto mode

You implemented Virtual Local Area Networks (VLANs) on the network to logically group the hosts according to their respective functions. You set up a network and configure a trunk link between two 2960 switches. You configure Dynamic Trunking Protocol (DTP) in the default mode on both the switches. After the configuration is complete, the trunk is not established. What is the most likely cause of the problem?

On each router, run the license call-home command. This command allows you to specify a product activation key, which the device will use to contact cisco .com to verify the licensed features for the device.

You manage a network with multiple cisco routers and switches. You receive a new product activation key (PAK) for the routers. You need to install the licenses on each router. What should you do?

From switch2, run the switchport mode trunk command on interface E24. By configuring the port as a trunk port it will allow the port to pass the specified VLANs across the link to switch1.

You manage a network with the topology shown in the exhibit. The relevant portion of the show running-config command for switch2 is also shown in the exhibit. The user from Host2 reports that Host2 cannot communicate with Host1. You need to ensure that Host2 can communicate with Host1. What should you do?

What is the show command to view the available space for a new system image?

command: show flash:

What is the show command to view if an interface has been configured as passive for the OSPF routing process?

command: show ip protocols Look for: Passive Interface(s): GigabitEthernet0/1

What is the show command to view the OSPF cost for a packet originating on HostA to reach HostB?

command: show ip route look for: O 10.2.2.0/24 [110/129] via 10.10.10.5, 00:42:01, serial0/0/0 Where 110 = the administrative distance, 110 is the default value for OSPF, and 129 is the metric or OSPF cost

What is the show command to view if SCP has been enabled and how can you make a backup of the IOS?

command: show running-config find the line indicating: ip scp server enable You should use an SCP client to connect to the device, which works as an SCP server. You could also use the copy command from another router and use the Secure Copy Protocol

What is the show command to verify which switch was elected root bridge for a vlan

command: show spanning-tree look for: the correct vlan Root ID Priority This bridge is the root

What is the show command to view the configuration register value?

command: show version look for configuration register 0x2102 You would change this value to recover a password on a cisco device and bypass the startup config file.

You plan to implement two routers in a redundant configuration. You have been given the following information to use with the new routers: Router1 interface: gigabitethernet1/0/1 Router1 Local IP address: 10.0.0.254 Router1 Redundant IP address: 10.0.0.1 You need to ensure that the router automatically fails over in the event of signal loss. From Router1, Which code block should you run?

configure terminal interface gigabitethernet1/0/1 ip address 10.0.0.254 255.255.255.0 standby 1 ip 10.0.0.1 standby 1 priority 100 standby 1 preempt

What is the severity level of Emergency?

severity =0

What is the severity level of Alert?

severity =1

What is the severity level of Critical?

severity =2

What is the severity level of Error?

severity =3

What is the severity level of Warning?

severity =4

What is the severity level of Notification?

severity =5

What is the severity level of Informational?

severity =6

What is the severity level of Debugging?

severity =7

How would you find the Autonomous System (AS) numbers for an ISP?

show ip bgp neighbors or show ip bgp summary look for the neighbors and verify the AS number below

What two commands can you use to resolve network connectivity issues?

sw-1(config)#interface gi0/0.20 sw-1(config)#encapsulation dot1Q 20

What is the command to configure a switch for spanning-tree root bridge on a vlan?

sw-1(config)#spanning tree vlan # priority 16384 example: sw-1(config)#spanning tree vlan 10 priority 16384 This command lowers the spanning-tree priority on the appropriate switch, for the appropriate vlan, to a legal level below the default priority value of 32768, ensuring root bridge election for the respective vlan.

Explain TCP

TCP sends multiple packets without marking their beginning or end. It also sends multiple packets per read call. This makes it unsuitable for data streaming such as live gaming or video streaming.

What does the B* symbol represent in the show ip route command?

The B code is a routing protocol code that identifies a route received via Border Gateway Protocol (BGP)

You should use : show aaa servers or show radius server-group all to verify what information?

The IP address of the RADIUS server.

What are the default administrative distances of RIP and OSPF

The default administrative distances are as follows OSPF - 110 RIP - 120 eBGP - 20 EIGRP (internal) - 90 EIGRP (external) - 170 iBGP - 200

Layer 2 (the data link layer) Ideally, when using the OSI-layered model approach for troubleshooting, the troubleshooting should start from the bottom layer of the OSI model and then move upwards one layer at a time. Therefore, you should not skip Layer 2 and trouble shoot Layer 3, 4 or 7 next

The exhibit displays a sample network diagram. In this network, Host A is able to communicate with Host C, but it is not able to communicate with Host B. You are using the Open System Interconnect (OSI)-layered model approach for troubleshooting the problem. You replace the cable connecting Switch A to Host B with a known working cable. Which OSI layer should you troubleshoot next to solve the problem?

32771 The spanning-tree priority for VLAN 2 on this switch is 32770, which is the sum of the default priority of 32768 plus the VLAN number 2. Therefore, the spanning-tree priority for VLAN 3 on this switch is 32768 + 3 for a total priority of 32771

The exhibit shows partial out put from the show spanning-tree command on a cisco catalyst 2960 switch. What will the spanning-tree priority for virtual local area network (VLAN) 3 be on this switch?

What is the impact of enabling BPDU Guard on a cisco switch?

All ports on a Port Fast-operational state will have BPDU Guard automatically enabled

What is the show command to view HSRP priority of a router?

Command: show standby brief or show standby The default HSRP priority is 100. You would use the standby 1 priority command to change this value. A router with the highest priority value becomes the active router. To configure standby priority use these commands: interface FastEthernet0/1 ip address 192.168.1.2 255.255.255.0 standby 1 ip 192.168.1.254 standby 1 priority 90

How would you verify which network has been advertised by an ISP?

First identify the network address of the ISP (view the topology diagram to see what interface it is on) Second use show ip interface brief to identify the ip address of that interface Third use show ip bgp command to identify the network / networks that have been advertised by that ISP IP address

What is the command for the automatic failover?

standby 1 preempt

There are not enough IP addresses in the DHCP server IP pool. With an address range of 172.16.10.0/29, the subnet has only six assignable host addresses. the first host address in the range would be 172.16.10.0, the last address would be 172.16.10.6, and the broadcast would be 172.16.10.7. The seventh host machine will not receive an IP address from the cisco IOS DHCP server because it has run out of address in the pool to assign. There are not enough ip address in the DHCP server IP pool to service seven hosts.

A cisco router is configured as a Dynamic Host Configuration Protocol (DHCP) server with the IP address pool 172.16.10.0/29 You add a new PC to the existing network of six hosts. After the initial configuration, you notice that the PC has not received an IP address from the cisco Internetwork operating system (IOS) DHCP server. At the same time the original six host machines in this network are working properly and receiving IP addresses from the DHCP pool. You verify this by pinging all of the hosts on the network from one of the hosts on the same network with an IP of 172.16.10.2. The following is the partial output of the ipconfig/all command from the machine that is experiencing problems: Ethernet adapter Local Area Connection: Connection-specific DNS Suffix: Description.......:Intel(R) PRO/100 VE Network Connection Physical Address ........:00-1C-24-37-3C-00 DHCP Enabled........:Yes Autoconfiguration enabled........:Yes What is the cause of the problem?

Describe two benefits of static routing.

A static route requires 16 octets of space with just over three kilobytes of overhead, and Static routing provides ease of routing table maintenance in smaller networks that are not expected to grow significantly in the future

Web1 sends a TCP Acknowledgement to the web server for the missing segment. The exhibit shows a simple example of TCP error recovery.

A web server named Web Server 1 is sending a web page to a web browser on a computer named Web1 using three separate messages. Each message has a TCP header and HTTP information in addition to the actual data. Each message has a sequence number. As shown in the exhibit, the web server sends three messages with their respective sequence numbers to Web1. Two messages with sequence number 1 and 3 reach their destination, but the message with sequence number 2 fails to reach the destination. Which action occurs so that Web1 receives message number 2?

What is the show command to view the IP address of the TFTP server?

Command: show archive To configure archive feature use these commands: archive path tftp://10.10.10.199 time-period 5 (the 5 is for 5 min) write-memory exit

What is the show command to view the reported distance to a network on a router?

Command: show ip eigrp topology The lines to look for are: P 1.1.1.0/24, 1 successors, FD is 156160 via 10.10.10.10 (156160/128256), FastEthernet0/0 The Feasible Distance (FD) is 156160, and the reported distance or Advertised distance (AD) is 128256

What is the show command to view all IP Service Level Agreement (SLA) settings?

Command: show ip sla configuration The lines to look for are: Type of operation to perform: icmp-echo Target address/Source address: 1.1.1.1/10.10.10.1 You would analyze this output to determine the type of operation and IP addresses of IP SLA. You would use the icmp-echo operation to check reachability. It is very similar to the ping command. You can specify some additional options such as frequency and source interface if needed.

What is the show command to view how many times IP SLA has been executed successfully on a router?

Command: show ip sla statistics The lines to look for are: Number of successes: 146 To configure IP SLA use these commands: ip sla 1 icmp-echo 1.1.1.1 source-interface FastEthernet0/0 frequency 5 ip sla schedule 1 life 5000 start-time now

What is the show command to view the Unique Device Identifier (UDI) of a router?

Command: show license udi The UDI is a unique string that combines the Product ID (PID), the serial number, and the hardware version. UDI is needed for license activation and support contracts. You would use the UDI and the Product Authorization Key (PAK) to generate a license using a dedicated portal from cisco. Finally, you would use the license install command to apply the new license CISCO887VA-K9 is not the UDI. It identifies the platform only FCZ1121C119 is the serial number only. c880data-universalk9-mz.152-3.t.bin is the IOS running on the device

What is the show command to view on which port a rogue switch is connected?

Command: show lldp neighbors With Link Layer Discovery Protocol (LLDP) you can view all of the directly connected devices. You would use the lldp run command to enable LLDP on a cisco device. It is disabled by default on many platforms LLDP is very similar to Cisco Discovery Protocol (CDP) but is vendor-neutral. You would use the show cdp neighbors command to view a CDP table.

What is the show command to view the severity level for buffer logging?

Command: show logging The severity levels are as follows: Emergency (severity =0 ) Alert (severity = 1) Critical (severity =2) Error (severity = 3) Warning (severity = 4) Notification (severity = 5) Informational (severity = 6) Debugging (severity = 7)

UDP can create a smooth data-streaming event because it sends packets without a beginning and an end. It is always one data packet per read call. UDP is used to send data packets, so it might drop a packet, but it does not miss a packet. When the packet is dropped, UDP will immediately send a similar packet again. It does not send 4 to 5 copies of a packet at once.

Explain UDP

Bus This is the topology used by 10Base2 networks

In which network topology is every host device effectively directly connected to every other host device through a common cable?

The telnet command is used to establish a remote connection over the?

Internet or LAN

Which three Spanning Tree Protocol (STP) implementations are supported on cisco switches

MST (Multiple Spanning Tree) PVRST+ (Per-VLAN Rapid Spanning Tree Plus) PVST+ (Per-VLAN Spanning Tree Plus)

You upgrade the Internetwork Operating System (IOS) on your router. You decide to save a back up copy of the IOS file to your Trivial File transfer protocol (TFTP) server on the local network Which IOS command should you use?

Router#copy flash tftp

show ip protocols and show ip route commands will verify what protocol?

Routing Information Protocol (RIP)

The show running-config command will show you if the enable secret password has been encrypted

True

When a packet is moving through a network, the source IP address and the destination IP address will be the same, but the source MAC address and destination MAC address will change.

True

The stack link speed has been doubled The maximum number of switches in a stack has been increased to 8

What are two main advantages of FlexStack-Plus over FlexStack ?

CDP will not be active, and the system will not return any error message.

What happens if you enable Cisco Discovery Protocol (CDP) on specified interfaces without enabling CDP globally on the device?

You apply the config below to a router: router(config)#snmp-server enable traps syslog router(config)#no snmp-server enable traps router(config)#snmp-server enable traps bgp router(config)#snmp-server enable traps hsrp router(config)#snmp-server host 10.0.0.1 public Which type or types of SNMP traps will be generated?

hsrp and bgp The no snmp-server enable traps command negates the previous command ( snmp-server enable traps syslog), which enabled syslog trap generation The next two commands enable BGP and Hot Standby Router Protocol (HSRP) trap generation. Therefore, because these two commands were issued after the no snmp-server enable traps command, the only traps that will be generated are BGP and HSRP

Which two commands would you use to correct the improper configuration of Hello and Dead timer intervals?

ip ospf hello-interval 10 ip ospf dead-interval 40

Which command would you use to resolve EIGRP routing problems?

network 10.10.10.0 0.0.0.3