Cisco Theory Flashcards
A network administrator is using the router-on-a-stick method to configure inter-VLAN routing. Switch port Gi1/1 is used to connect to the router. Which command should be entered to prepare this port for the task?
Switch(config)# interface gigabitethernet 1/1
Switch(config-if)# switchport mode trunk
Refer to the exhibit. The configuration shows commands entered by a network administrator for inter-VLAN routing. However, host H1 cannot communicate with H2. Which part of the inter-VLAN configuration causes the problem?
VLAN configuration
Refer to the exhibit. Inter-VLAN communication between VLAN 10, VLAN 20, and VLAN 30 is not successful. What is the problem?
The switch interface FastEthernet0/1 is configured as an access interface and should be configured as a trunk interface.
An employee connects wirelessly to the company network using a cell phone. The employee then configures the cell phone to act as a wireless access point that will allow new employees to connect to the company network. Which type of security threat best describes this situation?
rogue access point
Which combination of WLAN authentication and encryption is recommended as a best practice for home users?
WPA2 and AES
- What are the two methods that a wireless NIC can use to discover an AP? (Choose two.)
transmitting a probe request
and
receiving a broadcast beacon frame
- What address and prefix length is used when configuring an IPv6 default static route?
::/0
- Refer to the exhibit. Match the description with the routing table entries. (Not all options are used.)
Graphic contains output of show ip route as follows:
R3# show ip route 172.16.0.0/24 is subnetted, 3 subnets
C 172.16.0.0 is directly connected, Serial0/1/0
D 172.16.1.0 [90/21024000] via 172.16.0.1, 00:22:15, Serial0/1/0
C 172.16.2.0 is directly connected, Serial0/1/0
10.0.0.0/24 is subnetted, 1 subnets
S 10.2.0.0/24 [1/0] via 172.16.2.2
C 10.3.0.0 is directly connected, FastEthernet0/0
- route source protocol
- destination network
- metric
- administrative distate
- next hop
- route timestamp
- 172.16.2.2 => next hop
- 10.3.0.0 => destination network
- 2104000 => metric
- -
- 1 => administrative distance
- 00:22:15 => route timestamp
- D => route source protocol
- -
- Refer to the exhibit. Which interface will be the exit interface to forward a data packet that has the destination IP address 172.18.109.152?
Serial0/0/0
- Match the dynamic routing protocol component to the characteristic. (Not all options are used.)
data structures => tables or database that are stored in RAM
routing protocol messages => exchange routing information and maintains accurate information about networks
algorithm => a finite list of steps used to determine the best path
- Which statement describes the behavior of a switch when the MAC address table is full?
It treats frames as unknown unicast and floods all incoming frames to all ports within the local VLAN.
Which term describes the role of a Cisco switch in the 802.1X port-based access control?
authenticator
- What is a result of connecting two or more switches together?
The size of the broadcast domain is increased.
- A small publishing company has a network design such that when a broadcast is sent on the LAN, 200 devices receive the transmitted broadcast. How can the network administrator reduce the number of devices that receive broadcast traffic?
Segment the LAN into smaller LANs and route between them.
15.Refer to the exhibit. How is a frame sent from PCA forwarded to PCC if the MAC address table on switch SW1 is empty?
SW1 floods the frame on all ports on SW1, excluding the port through which the frame entered the switch.
- What are two switch characteristics that could help alleviate network congestion? (Choose two.)
fast internal switching
large frame buffers
- A network engineer is configuring a LAN with a redundant first hop to make better use of the available network resources. Which protocol should the engineer implement?
GLBP
- Match the FHRP protocols to the appropriate description. (Not all options are used.)
a Cisco proprietary FHRP that provides load sharing in addition to redundancy => GLBP
a Cisco proprietary FHRP that provides redundancy through use of an active device and standby device => HSRP
an open standard FHRP that provides redundancy through use of a virtual routers master and one of more backups => VRRP
- After sticky learning of MAC addresses is enabled, what action is needed to prevent dynamically learned MAC addresses from being lost in the event that an associated interface goes down?
Copy the running configuration to the startup configuration.
- A small coffee shop is offering free Wi-Fi to customers. The network includes a wireless router and a DSL modem that is connected to the local phone company. What method is typically used to configure the connection to the phone company?
Set the WAN connection in the wireless router as a DHCP client.
- Match the purpose with its DHCP message type. (Not all options are used.)
DHCPREQUEST => a message that is used to identify the explicit server and lease offer to accept
DHCPDISCOVER => a message that is used to locate any available DHCP server on a network
DHCPOFFER => a message that is used to suggest a lease to a client
DHCPACK => a message that is used to acknowledge that the lease is successful
- Match the spanning-tree feature with the protocol type. (Not all options are used.)
PVST+ => Cisco implementation of IEEE 802.1D
RSTP => Fast converging enhancement of IEEE 802.1D
MSTP => IEEE standard that reduces the number of STP instances
Rapid PVST+ => Proprietary per VLAN implementation of IEEE 802.1w
- Which three components are combined to form a bridge ID?
MAC address
extended system ID
bridge priority
- What is an advantage of PVST+?
PVST+ optimizes performance on the network through load sharing.
- Which problem is evident if the show ip interface command shows that the interface is down and the line protocol is down?
A cable has not been attached to the port.
- A technician is configuring a new Cisco 2960 switch. What is the effect of issuing the BranchSw(config)#interface VLAN88 command?
It enters configuration mode for a switch virtual interface.
- In what situation would a Layer 2 switch have an IP address configured?
when the Layer 2 switch needs to be remotely managed
- Which command would create a valid IPv6 default route?
ipv6 route ::/0 2001:db8:acad:2::a
- Refer to the exhibit. The routing table for R2 is as follows:
What will router R2 do with a packet destined for 192.168.10.129?
send the packet out interface Serial0/0/1
- Refer to the exhibit. Router R1 has an OSPF neighbor relationship with the ISP router over the 192.168.0.32 network. The 192.168.0.36 network link should serve as a backup when the OSPF link goes down. The floating static route command ip route 0.0.0.0 0.0.0.0 S0/0/1 100 was issued on R1 and now traffic is using the backup link even when the OSPF link is up and functioning. Which change should be made to the static route command so that traffic will only use the OSPF link when it is up?
Change the administrative distance to 120.
- A junior technician was adding a route to a LAN router. A traceroute to a device on the new network revealed a wrong path and unreachable status. What should be done or checked?
Check the configuration of the exit interface on the new static route.
- Refer to the exhibit. When a packet arrives on interface Serial0/0/0 on R1, with a destination IP address of PC1, which two events occur? (Choose two)
Router R1 will forward the packet out Gig0/1.
Router R1 will de-encapsulate the packet and encapsulate it in an Ethernet frame.
- Refer to the exhibit. How was the host route 2001:DB8:CAFE:4::1/128 installed in the routing table?
The route was manually entered by an administrator.
- Which command will start the process to bundle two physical interfaces to create an EtherChannel group via LACP?
interface range GigabitEthernet 0/4 – 5
- Refer to the exhibit. Based on the command output shown, what is the status of the EtherChannel?
The EtherChannel is in use and functional as indicated by the SU and P flags in the command output.
- Refer to the exhibit. DLS1 is connected to another switch, DLS2, via a trunk link. A host that is connected to DLS1 is not able to communicate to a host that is connected to DLS2, even though they are both in VLAN 99. Which command should be added to Fa0/1 on DLS1 to correct the problem?
switchport trunk native vlan 66
- Which type of traffic is designed for a native VLAN?
untagged
- Refer to the exhibit. PC-A and PC-B are both in VLAN 60. PC-A is unable to communicate with PC-B. What is the problem?
The VLAN that is used by PC-A is not in the list of allowed VLANs on the trunk.
- Question as presented: Match the DTP mode with its function. (Not all options are used.)
passively waits for the neighbour to initiate trunking => dynamic auto
requires manual configuration of trunking or nontrunking => nonegotiate
actively attempts to convert the link to a trunk => dynamic desireable
permanent trunking mode => trunk
- What type of VLAN is configured specifically for network traffic such as SSH, Telnet, HTTPS, HTTP, and SNMP?
management VLAN
- Refer to the exhibit. The users on the LAN network of R1 cannot receive an IPv6 address from the configured stateful DHCPv6 server. What is missing from the stateful DHCPv6 configuration on router R1?
The FA0/0 interface is missing the command that informs the clients to use stateful DHCPv6.
- A network administrator is implementing DHCPv6 for the company. The administrator configures a router to send RA messages with M flag as 1 by using the interface command ipv6 nd managed-config-flag . What effect will this configuration have on the operation of the clients?
Clients must use all configuration information that is provided by a DHCPv6 server.
- Refer to the exhibit. A network administrator is troubleshooting a problem with EtherChannel. What command was used to produce the exhibited output?
show interfaces fastethernet 0/11 etherchannel
- Refer to the exhibit. The administrator wants to enable port security on an interface on switch S1, but the command was rejected. Which conclusion can be drawn?
The interface must be initially configured with the switchport mode access command.
- On which port should Dynamic ARP Inspection (DAI) be configured on a switch?
an uplink port to another switch
- Refer to the exhibit. A network administrator is configuring DAI on switch SW1. What is the result of entering the exhibited commands?
DAI will validate only the destination MAC addresses.
- Which Cisco solution helps prevent ARP spoofing and ARP poisoning attacks?
Dynamic ARP Inspection
- What is the reason for disabling SSID broadcasting and changing the default SSID on a wireless access point?
Wireless clients must then have the SSID manually configured to connect to the wireless network.
- What are two characteristics of Cisco Express Forwarding (CEF)? (Choose two.)
This is the fastest forwarding mechanism on Cisco routers and multilayer switches.
Packets are forwarded based on information in the FIB and an adjacency table.
- A network administrator of a college is configuring WLAN security with WPA2 Enterprise authentication. Which server is required when deploying this type of authentication?
RADIUS
- What is a potential issue when using the WLC to upgrade and deploy the latest firmware image to all APs?
Users will not be able to use the WLAN.
- A network administrator is configuring a WLC to provide WLAN access to users in an office building. When testing the newly created WLAN, the administrator does not see the SSID from a wireless device. What is a possible cause?
The new WLAN needs to be enabled.
- What is the best way to prevent a VLAN hopping attack?
Disable trunk negotiation for trunk ports and statically set nontrunk ports as access ports.
- An administrator has configured a DHCPv4 relay router and issued these commands:
The clients are not receiving IP parameters from the DHCPv4 server. What is a possible cause?
The ip helper-address command is missing.
- Consider the following command:
What does the 5 at the end of the command signify?
administrative distance
What type of VLAN is configured specifically for network traffic such as SSH, Telnet, HTTPS, HTTP, and SNMP?
Management VLAN
