Exam3/CCNA

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

A static IP-to-MAC address entry

What is one advantage that the IPv6 simplified header offers over IPv4?

Better routing efficiency and efficient packet handling for performance and forwarding-rate scalability

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 a network administrator could test whether the banner is properly configured?

Exit privileged EXEC mode and press Enter.

Refer to the exhibit. Consider the IP address configuration shown from PC1. What is a description of the default gateway address?

It is the IP address of the Router1 interface that connects the PC1 LAN to Router1.

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

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

Manually configuring static ARP associations could facilitate ARP poisoning or MAC address spoofing. 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. Large numbers of ARP request broadcasts could cause the host MAC address table to overflow and prevent the host from communicating on the network. Multiple ARP replies result in the switch MAC address table containing entries that match the MAC addresses of hosts that are connected to the relevant switch port.

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

The ARP cache

A network technician issues the arp -d* command on a PC after the router that is connected to the LAN is reconfigured. What is the result after this command is issued?

The ARP cache is cleared. The current content of the ARP cache is displayed. The detailed information of the ARP cache is displayed. The ARP cache is synchronized with the router interface.

What is the effect of using the Router# copy running-config startup-config command on a router?

The contents of ROM will change.

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. The source MAC address appears in the header of the Ethernet frame. The type field 0x806 appears in the header of the Ethernet frame. ARP replies are broadcast on the network when a host receives an ARP request.

The global configuration command ip default-gateway 172.16.100.1 is applied to a switch. What is the effect of this command?

The switch can communicate with other hosts on the 172.16.100.0 network. The switch is limited to sending and receiving frames to and from the gateway 172.16.100.1. The switch will have a management interface with the address 172.16.100.1. The switch can be remotely managed from a host on another network

Refer to the exhibit. The exhibit shows a small switched network and the contents of the MAC address table of the switch. PC1 has sent a frame addressed to PC3. What will the switch do with the frame?

The switch will discard the frame. The switch will forward the frame only to port 2. The switch will forward the frame to all ports except port 4. The switch will forward the frame to all ports. The switch will forward the frame only to ports 1 and 3.

Which two functions re primary functions of a router? (Choose two)

accepts a packet and accesses its routing table to determine the appropriate exit interface based on the destination address.

Which two types of IPV6 messages are used in place of ARP for address resolution?

anycast broadcast echo reply echo request neighbor solicitation neighbor advertisement

Which three commands are used to set up secure access to a router through a connection to the console interface? (Choose three)

interface fastethernet 0/0 line vty 0 4 line console 0 enable secret cisco login password cisco

How do hosts ensure that their packets are directed to the correct network destination?

maintain their own local routing table

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

protocol destination IPv4 address source IPv4 address TTL

What is the aim of an ARP spoofing attack?

to flood the network with ARP reply broadcasts to fill switch MAC address tables with bogus addresses to associate IP addresses to the wrong MAC address to overwhelm network hosts with ARP requests