Cisco Competency Assessment Flashcards

These flashcards cover key concepts and terminology relevant to the Cisco Competency Assessment.

What type of network would the employee access to access confidential information from internal servers?

An intranet.

What command prevents all unencrypted passwords from displaying in plain text?

(config)# service password-encryption.

Which modes can be protected with passwords?

Privileged EXEC mode, Router configuration mode, Console interface.

What is the result of issuing the command 'copy running-config startup-config'?

The new configuration will be stored in flash memory.

Which interface allows remote management of a Layer 2 switch?

The switch virtual interface.

What password is needed to access user EXEC mode via console connection?

lineconin.

How does SSH differ from Telnet?

SSH encrypts messages and uses user authentication, while Telnet sends messages in plaintext.

What does the command 'reload' do if changes were not saved?

Issues a reload without saving the running configuration.

What does 'service password-encryption' command accomplish?

It automatically encrypts passwords in configuration files currently stored in NVRAM.

What property identifies network and host portion for an IPv4 address?

Subnet mask.

Why would a Layer 2 switch need an IP address?

To enable the switch to be managed remotely.

What does the loopback test provide?

The TCP/IP stack on the device is working correctly.

What routing table entry has a next hop address associated with a destination network?

Remote routes.

Why is NAT not needed in IPv6?

Anyone can get a public IPv6 address due to the large number of available IPv6 addresses.

What is the purpose of configuring a switch with a default gateway address?

Used to forward packets originating from the switch to remote networks.

What could prevent a computer from accessing devices on other networks?

The computer has an invalid default gateway address.

What happens when the command 'transport input ssh' is entered?

Communication between the switch and remote users is encrypted.

Which commands are used to set up secure access to a router?

password cisco, login, line console 0.

Which address prefix range is reserved for IPv4 multicast?

224.0.0.0 - 239.255.255.255.

What is the broadcast address for network 172.16.16.0/22?

172.16.19.255.

Why would a PC show an IP address of 169.254.10.3?

The PC cannot contact a DHCP server.

How is a Layer 2 switch managed?

By assigning an IP address.

How many usable host IP addresses are in a /26 mask?

62.

What are the three blocks of addresses defined by RFC 1918 for private network use?

10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16.

Which type of IPv6 address refers to any unicast address assigned to multiple hosts?

Anycast.

What is the expected outcome when generating an EUI-64 address?

The seventh bit of the original MAC address is inverted.

What type of address is 2001:db8::1?

A global unicast address.

How does HSRP provide first hop redundancy?

It uses a shared virtual MAC and a virtual IP address.

What is the role of DHCP?

To dynamically assign IP addresses to clients.

What causes a port to be placed in the err-disabled state?

Port security violation.

Which command is used to determine what interface a router will use to reach remote networks?

show ip route.

What happens if SSH is configured on a router?

User must authenticate using a username/password combination.

What command configures a static route for 172.21.34.0/25?

ip route 172.21.34.0 255.255.255.128 10.73.65.66.

Which command sets a primary router's priority?

standby priority .

What two types of addresses are valid public addresses?

64.104.78.227, 198.133.219.17.

What action ensures the backup floating static route is used when the primary route fails?

The floating static route must have a higher administrative distance than the primary route.

What does NAT overload allow?

Many hosts inside a private network to share a single public IP address.

Why was RFC 1918 defined?

To conserve public IPv4 addresses.

Which command adds a subinterface for VLAN 20 on R1?

ip address 10.20.20.1 255.255.255.0.

What must be configured for IPv6 local link communication?

FE80::/10 addresses.

Which command is used to check active NAT translations?

show ip nat translations.

What is the function of a default gateway in a VLAN?

Used by devices on a subnet to communicate outside their local network.

Which command starts DHCP service on a router?

service dhcp.

What does IPSEC provide?

Secure Internet Protocol communications.

How many host addresses on 172.16.128.0 with a mask of 255.255.252.0?

2046.

What two addresses do R1's static NAT entries need?

Inside local and outside global addresses.

What protocol does NAT work in conjunction with?

NAT works alongside multiple protocols including IP.

How are DHCP requests generally sent?

UDP.

What two tasks to perform when configuring static NAT?

Define inside local and inside global addresses.

What is needed for port security on a switch?

MAC address learning.

What does the purpose of the DHCP server provide?

Automatic IP configuration for devices.

How long can DHCP lease durations be configured?

From seconds to several weeks.

What are two common methods for deriving a subnet mask?

CIDR and classful addressing.

What determines a MAC address uniqueness?

The combination of manufacturer ID and device ID.

What is the action for a switch port in err-disabled state?

It cannot forward packets until re-enabled.

Which command disables a port security violation?

shutdown.

Which protocol supports secure CLI access to network devices?

SSH.

What is a primary role of a switch in a network?

Forward frames based on MAC addresses.

What is a method for determining IP address status?

ping.

What regularity does an IP address maintain in a DHCP pool?

Dynamic allocation.

What is the maximum number of hosts for a /29 subnet?

6.

What command verifies the interface status?

show interfaces.

What is needed for a switch to obtain its IP address?

Default gateway.

Which command shows active interfaces on a router?

show ip interface brief.

What setting needs to be configured to enable SSH?

Transport input ssh.

What method improves speed on a switch?

Switch port fast.

How many subnets in a /24 with a subnet mask of /26?

4.

What protocol creates a location-aware network?

NAT.

How can a router send packets to a private address?

NAT translates private to public.

What is the significant feature of private addresses?

They are not routable on the global Internet.

What is a static NAT?

One-to-one mapping between private and public IP.

What is the default private address block?

10.0.0.0/8.

What do dynamic NAT routes provide?

Temporary mapping of internal to external IPs.

What command configures NAT overload?

ip nat inside source list [AccessList] interface [interface] overload.

What is the implication of a local area network?

Devices in close physical proximity.

What do link-local addresses facilitate?

Local device communication without routing.