CCNA1 v5 + v5.02 Chapter 5 Exam Answers
1. Which statement is true about MAC addresses?
- A NIC only needs a MAC address if connected to a WAN.
- The first three bytes are used by the vendor assigned OUI.
- MAC addresses are implemented by software.
- The ISO is responsible for MAC addresses regulations.
2. Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.)
- Logical link control is specified in the IEEE 802.3 standard.
- Logical link control is implemented in software.
- The data link layer uses LLC to communicate with the upper layers of the protocol suite.
- The LLC sublayer is responsible for the placement and retrieval of frames on and off the media.
- The LLC sublayer interacts directly with the NIC driver software.
3. What is the purpose of the preamble in an Ethernet frame?
- is used for timing synchronization
- is used to identify the source address
- is used as a padding for data
- is used to identify the destination address
4. Which two statements are correct about MAC and IP addresses during data transmission if NAT is not involved? (Choose two.)
- A packet that has crossed four routers has changed the destination IP address four times.
- Destination and source MAC addresses have local significance and change every time a frame goes from one LAN to another.
- Destination MAC addresses will never change in a frame that goes across seven routers.
- Every time a frame is encapsulated with a new destination MAC address, a new destination IP address is needed.
- Destination IP addresses in a packet header remain constant along the entire path to a target host.
5. What is a characteristic of a contention-based access method?
- It processes more overhead than the controlled access methods do.
- It has mechanisms to track the turns to access the media.
- It scales very well under heavy media use.
- It is a nondeterministic method.
6. What is the Layer 2 multicast MAC address that corresponds to the Layer 3 IPv4 multicast address 188.8.131.52?
7. A host is trying to send a packet to a device on a remote LAN segment, but there are currently no mappings in its ARP cache. How will the device obtain a destination MAC address?
- It will send an ARP request for the MAC address of the default gateway.
- It will send an ARP request for the MAC address of the destination device.
- It will send the frame with a broadcast MAC address.
- It will send a request to the DNS server for the destination MAC address.
- It will send the frame and use its own MAC address as the destination.
8. What are two features of ARP? (Choose two.)
- If no device responds to the ARP request, then the originating node will broadcast the data packet to all devices on the network segment.
- An ARP request is sent to all devices on the Ethernet LAN and contains the IP address of the destination host and its multicast MAC address.
- When a host is encapsulating a packet into a frame, it refers to the MAC address table to determine the mapping of IP addresses to MAC addresses.
- If a host is ready to send a packet to a local destination device and it has the IP address but not the MAC address of the destination, it generates an ARP broadcast.
- If a device receiving an ARP request has the destination IPv4 address, it responds with an ARP reply.
9. 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.
10. Refer to the exhibit. PC1 issues an ARP request because it needs to send a packet to PC2. In this scenario, what will happen next??
- RT1 will send an ARP reply with the PC2 MAC address.
- RT1 will send an ARP reply with its Fa0/0 MAC address.
- SW1 will send an ARP reply with the PC2 MAC address.
- PC2 will send an ARP reply with its MAC address.
- SW1 will send an ARP reply with its Fa0/1 MAC address.
11. A network administrator is connecting two modern switches using a straight-through cable. The switches are new and have never been configured. Which three statements are correct about the final result of the connection? (Choose three.)
- The link between switches will work as full-duplex.
- If both switches support different speeds, they will each work at their own fastest speed.
- The link between the switches will work at the fastest speed that is supported by both switches.
- The connection will not be possible unless the administrator changes the cable to a crossover cable.
- The duplex capability has to be manually configured because it cannot be negotiated.
- The auto-MDIX feature will configure the interfaces eliminating the need for a crossover cable.
12. When would a switch record multiple entries for a single switch port in its MAC address table?
- when a router is connected to the switch port
- when another switch is connected to the switch port
- when multiple ARP broadcasts have been forwarded
- when the switch is configured for Layer 3 switching
13. 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.
- The switch will forward the frame only to ports 1 and 3.
- The switch will forward the frame to all ports except port 4.
14. A Layer 2 switch is used to switch incoming frames from a 1000BASE-T port to a port connected to a 100Base-T network. Which method of memory buffering would work best for this task?
- fixed configuration buffering
- level 1 cache buffering
- shared memory buffering
- port-based buffering
15. A network administrator issues the following commands on a Layer 3 switch:
DLS1(config)# interface f0/3
DLS1(config-if)# no switchport
DLS1(config-if)# ip address 172.16.0.1 255.255.255.0
DLS1(config-if)# no shutdown
What is the administrator configuring?
- a trunk interface
- a switched virtual interface
- a Cisco Express Forwarding instance
- a routed port
16. Which two statements describe a fixed configuration Ethernet switch? (Choose two.)
- An SVI cannot be configured on the switch.
- A fixed configuration switch may be stackable.
- The switch cannot be configured with multiple VLANs.
- The number of ports on the switch cannot be increased.
- The port density of the switch is determined by the Cisco IOS.
17. Which address or combination of addresses does a Layer 3 switch use to make forwarding decisions?
- port address only
- MAC address only
- MAC and port addresses
- MAC and IP addresses
- IP address only
18. How does adding an Ethernet line card affect the form factor of a switch?
- by increasing the back plane switching speed
- by making the switch stackable
- by expanding the NVRAM capacity
- by expanding the port density
19. What statement illustrates a drawback of the CSMA/CD access method?
- It is more complex than non-deterministic protocols.
- Collisions can decrease network performance.
- Deterministic media access protocols slow network performance.
- CSMA/CD LAN technologies are only available at slower speeds than other LAN technologies.
20. Open the PT Activity. Perform the tasks in the activity instruction and then answer the question.
What destination address will PC1 include in the destination address field of the Ethernet frame that it sends to PC2?
21. Match the seven fields of an Ethernet frame to their respective contents. (Not all options are used.)