CCNA 1: Module Exam 8-10 Part 2

ARP Spoofing Attack

A malicious host intercepts ARP requests and replies to them so that network hosts will map an IP address to the MAC address of the malicious host

What property of ARP allows MAC addresses of frequently used servers to be fixed in the ARP table?

A static IP-to-MAC address can be entered manually into an ARP table.

Where are IPv4 address to Layer 2 Ethernet address mappings maintained on a host computer?

ARP cache

What happens when the transport input ssh command is entered on the switch VTY lines?

Communication between the switch and remote users is encrypted.

Which term describes a field in the IPv4 header that contains a unicast, multicast, or broadcast address?

Destination IPv4 address

Which term describes a field in the IPv4 header that contains an 8-bit binary value used to determine the priority of each packet?

Differentiated services

What property of ARP causes cached IP-to-MAC mappings to remain in memory longer?

Entries in an ARP table are time-stamped and are purged after the timeout expires.

A new network administrator has been asked to enter a banner message on a Cisco device. What is the fastest way a network administrator could test whether the banner is properly configured?

Exit privileged EXEC mode and press Enter.

Which term describes a field in the IPv4 header used to detect corruption in the IPv4 header?

Header checksum

What property of ARP allows hosts on a LAN to send traffic to remote networks?

Local hosts learn the MAC address of the default gateway.

Which term describes a field in the IPv4 header used to identify the next level protocol?

Protocol

Which term describes a field in the IPv4 header that contains a 32-bit binary value associated with an interface on the sending device?

Source IPv4 address

Which term describes a field in the IPv4 header used to limit the lifetime of a packet header?

TTL (time-to-live)

A router boots and enters setup mode. What is the reason for this?

The configuration file is missing from NVRAM.

What property of ARP forces all Ethernet NICs to process an ARP request?

The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame.

Which address does the user PC target in order to forward its data off the local area network? (When using tracert ___ command)

The first hop (default-gateway)

What will happen if the default gateway address is incorrectly configured on a host?

The host cannot communicate with hosts in other networks.

What property of ARP causes a REPLY only to the source sending an ARP request?

The source MAC address appears in the header of the Ethernet frame.

The global configuration command ip default-gateway 172.168.100.1 is applied to a switch. What is the effect of this command?

The switch can be remotely managed from a host on another network.

What property of ARP causes the NICs recording an ARP request to pass the data portion of the Ethernet frame to the ARP process?

The type field 0x806 appears in the header of the Ethernet frame.

What is the aim of an ARP spoofing attack?

To associate IP addresses to the wrong MAC address

Which term describes a field in the IPv4 header that contains a 4-bit binary value set to 0100?

Version

What important information is examined in the Ethernet frame header by a Layer 2 device in order to forward the data onward?

destination MAC address

What are two potential network problems that can result from ARP operation?

•On large networks with low bandwidth, multiple ARP broadcasts could cause data communication delays. •Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent of intercepting network traffic.

Which two types of IPv6 messages are used in place of ARP for address resolution?

•neighbor solicitation •neighbor advertisement

What two function are primary functions of a router?

•packet forwarding •path selection

Which three commands are used to set up a password for a person who attaches a cable to a new router so that an initial configuration can be performed? (Choose three.)

•password cisco •line console 0 •login

What are two functions of NVRAM?

•to retain contents when power is removed •to store the startup configuration file