CCNA Modules 8-10
What are two potential network problems that can result from ARP operation? (Choose two.)
1. On large networks with low bandwidth, multiple ARP broadcasts could cause data communication delays. 2. Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent of intercepting network traffic.
Which two functions are primary functions of a router? (Choose two.)
1. Packet forwarding 2. Path selection
Which three commands are used to set up secure access to a router through a connection to the console interface? (Choose three.)
1. login 2. line console 0 3. password cisco
What are two services provided by the OSI network layer? (Choose two.)
1. routing packets toward the destination 2. encapsulating PDUs from the transport layer
What are two functions of NVRAM? (Choose two.)
1. to retain contents when power is removed 2. to store the startup configuration file
Where are IPv4 address to Layer 2 Ethernet address mappings maintained on a host computer?
ARP cache
Why is NAT not needed in IPv6?
Any host or user can get a public IPv6 network address because the number of available IPv6 addresses is extremely large.
Which destination address is used in an ARP request frame?
FFFF.FFFF.FFFF
When transporting data from real-time applications, such as streaming audio and video, which field in the IPv6 header can be used to inform the routers and switches to maintain the same path for the packets in the same conversation?
Flow Label
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.
A computer can access devices on the same network but cannot access devices on other networks. What is the probable cause of this problem?
The computer has an invalid default gateway address.
What is the effect of using the Router# copy running-config startup-config command on a router?
The contents of NVRAM will change.
What will happen if the default gateway address is incorrectly configured on a host?
The host cannot communicate with hosts in other networks.
What is a basic characteristic of the IP protocol?
connectionless
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 routing table entry has a next hop address associated with a destination network?
remote routes
Which parameter does the router use to choose the path to the destination when there are multiple routes available?
the lower metric value that is associated with the destination network
What statement describes the function of the Address Resolution Protocol?
ARP is used to discover the MAC address of any host on the local network.
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 statement describes a feature of the IP protocol?
IP relies on upper layer services to handle situations of missing or out-of-order packets.
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.
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 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 forward the frame to all ports except port 4.
What is one advantage that the IPv6 simplified header offers over IPv4?
efficient packet handling
Which term describes a field in the IPv4 packet header that contains a 32-bit binary value associated with an interface on the sending device?
source IPv4 address
What is the aim of an ARP spoofing attack?
to associate IP addresses to the wrong MAC address
