Chapter 5 Exam
Fill in the blank. The Ethernet ________ sublayer is responsible for communicating directly with the physical layer.
MAC
Fill in the blank. On Ethernet networks, the hexadecimal address FF-FF-FF-FF-FF-FF represents the __________ MAC address.
broadcast
Choose feature which describe either cut-through switching or store-and-forward switching (not all options used). 1. Always stores the entire frame 2. Checks the CRC before forwarding 3. Checks the frame length before forwarding 4. Does not forward broadcasts 5. Has low latency 6. May forward runt frames 7. Begins forwarding when the destination address is received
cut-through - 5, 6, 7 store-and-forward - 1, 2, 3
True or False? When a device is sending data to another device on a remote network, the Ethernet frame is sent to the MAC address of the default gateway
true
Fill in the blank. The binary number 0000 1010 can be expressed as ______ in hexadecimal.
0A
What is auto-MDIX? 1. A feature that detects Ethernet cable type 2. A type of port on a Cisco switch 3. An Ethernet connector type 4. A type of Cisco switch
1
What is the minimum Ethernet frame size that will not be discarded by the receiver as a runt frame? 1. 64 bytes 2. 512 bytes 3. 1024 bytes 4. 1500 bytes
1
What statement describes a characteristic of MAC addresses? 1. They must be globally unique. 2. They have a 32-bit binary value. 3. They are only routable within the private network. 4. They are added as part of a Layer 3 PDU
1
When the store-and-forward method of switching is in use, what part of the Ethernet frame is used to perform an error check? 1. CRC in the trailer 2. Source MAC address in the header 3. Destination MAC address in the header 4. Protocol type in the header
1
Which statement describes the treatment of ARP requests on the local link? 1. They are received and processed by every device on the local network. 2. They are dropped by all switches on the local network. 3. They are received and processed only by the target device. 4. They must be forwarded by all routers on the local network
1
Which two functions or operations are performed by the MAC sublayer? (Choose two.) 1. It is responsible for Media Access Control. 2. It performs the function of NIC driver software. 3. It adds a header and trailer to form an OSI Layer 2 PDU. 4. It handles communication between upper and lower layers. 5. It adds control information to network protocol layer data
1, 3
Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.) 1. The data link layer uses LLC to communicate with the upper layers of the protocol suite. 2. Logical link control is specified in the IEEE 802.3 standard. 3. The LLC sublayer is responsible for the placement and retrieval of frames on and off the media. 4. Logical link control is implemented in software. 5. The LLC sublayer adds a header and a trailer to the data
1, 4
Refer to the exhibit. A switch with a default configuration connects four hosts. The ARP table
2
Refer to the exhibit. PC1 issues an ARP request because it needs to send a packet to PC3. In this scenario, what will happen next? 1. RT1 will forward the ARP request to PC3. 2 RT1 will send an ARP reply with its own Fa0/0 MAC address. 3. RT1 will send an ARP reply with the PC3 MAC address. 4. SW1 will send an ARP reply with its Fa0/1 MAC address. 5. RT1 will send an ARP reply with its own Fa0/1 MAC address
2
Refer to the exhibit. The switches are in their default configuration. Host A needs to communicate with host D, but host A does not have the MAC address for its default gateway. Which network hosts will receive the ARP request sent by host A? 1. Only hosts A, B, and C 2. Only hosts B, C, and router R1 3. Only host D 4. Only hosts A, B, C, and D 5. Only router R1 6. Only hosts B and C
2
Refer to the graphic. H2 has sent a broadcast message to all of the hosts. If host H1 wants to reply to the broadcast message, which statement is true? 1. H1 sends a unicast message to H2, but the switch forwards it to all devices. 2. H1 sends a unicast message to H2, switch forwards it directly to H2. 3. H1 sends a broadcast message to H2, and the switch forwards it to all devices. 4. H1 sends a multicast message to H2, and the switch forwards it directly to H2
2
The ARP table in a switch maps which two types of address together? 1. Layer 2 address to a Layer 4 address. 2. Layer 3 address to a Layer 2 address. 3. Layer 4 address to a Layer 2 address. 4. Layer 3 address to a Layer 4 address
2
What is the primary purpose of ARP? 1. Translate URLs to IP addresses. 2. Resolve IPv4 addresses to MAC addresses. 3. Provide dynamic IP configuration to network devices. 4. Convert internal private addresses to external public addresses
2
Which action is taken by a Layer 2 switch when it receives a Layer 2 broadcast frame? 1. It drops the frame. 2. It sends the frame to all ports except the port on which it received the frame. 3. It sends the frame to all ports that are registered to forward broadcasts. 4. It sends the frame to all ports
2
Which statement describes Ethernet? 1 It defines a standard model used to describe how networking works. 2. It defines the most common LAN type in the world. 3. It is the required Layer 1 and 2 standard for Internet communication. 4. It connects multiple sites such as routers located in different countries
2
Which switching method uses the CRC value in a frame? 1. Fast-forward 2. Store-and-forward 3. Fragment-free 4. Cut-through
2
What are two sizes (minimum and maximum) of an Ethernet frame? (Choose two.) 1. 56 bytes 2. 64 bytes 3. 1024 bytes 4. 1518 bytes 5. 128 bytes
2, 4
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? 1. Port-based buffering 2. Level 1 cache buffering 3. Shared memory buffering 4. Fixed configuration buffering
3
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? 1. The switch will forward the frame only to port 2. 2. The switch will discard the frame. 3. The switch will forward the frame to all ports except port 4. 4. The switch will forward the frame to all ports. 5. The switch will forward the frame only to ports 1 and 3
3
Refer to the exhibit. What is the destination MAC address of the Ethernet frame as it leaves the web server if the final destination is PC1? 1. 00-60-2F-3A-07-AA 2. 00-60-2F-3A-07-BB 3. 00-60-2F-3A-07-CC 4. 00-60-2F-3A-07-DD
3
What happens to runt frames received by a Cisco Ethernet switch? 1. The frame is returned to the originating network device. 2. The frame is sent to the default gateway. 3. The frame is dropped. 4. The frame is broadcast to all other devices on the same network
3
What is the aim of an ARP spoofing attack? 1. To overwhelm network hosts with ARP requests. 2. To fill switch MAC address tables with bogus addresses. 3. To associate IP addresses to the wrong MAC address. 4. To flood the network with ARP reply broadcasts
3
What are two potential network problems that can result from ARP operation? (Choose two.) 1. 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. 2. Large numbers of ARP request broadcasts could cause the host MAC address table to overflow and prevent the host from communicating on the network. 3. On large networks with low bandwidth, multiple ARP broadcasts could cause data communication delays. 4. Manually configuring static ARP associations could facilitate ARP poisoning or MAC address spoofing. 5. Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent of intercepting network traffic
3, 5
What addressing information is recorded by a switch to build its MAC address table? 1. The destination Layer 2 address of outgoing frames. 2. The destination Layer 3 address of incoming packets. 3. The source Layer 3 address of outgoing packets. 4. The source Layer 2 address of incoming frames
4
What is a characteristic of port-based memory buffering? 1. Frames in the memory buffer are dynamically linked to destination ports. 2. All ports on a switch share a single memory buffer. 3. All frames are stored in a common memory buffer. 4. Frames are buffered in queues linked to specific ports
4
What type of address is 01-00-5E-0A-00-02? 1. An address that reaches every host inside a local subnet. 2. An address that reaches one specific host. 3. An address that reaches everu host in the network. 4. An address that reaches a specific group of hosts
4
When a switch configuration includes a user-defined error threshold on a per-port basis, to which switching method will the switch revert when the error threshold is reached? 1. Fragment-free 2. Fast-forward 3. Cut-through 4. Store-and-forward
4
Which statement is true about MAC addresses? 1. The ISO is responsible for MAC addresses regulations. 2. MAC addresses are implemented by software. 3. A NIC only needs a MAC address if connected to a WAN. 4. The first three bytes are used by the vendor assigned OUI
4
What is the decimal equivalent of the hexadecimal value of 3F? 1. 18 2. 34 3. 45 4. 46 5. 63
5
Which destination address is used in an ARP request frame? 1. 01-00-5E-00-AA-23 2. 0.0.0.0 3. 255.255.255.255 4. 127.0.0.1 5. FFFF.FFFF.FFFF
5
Fill in the blank using a number. The minimum Ethernet frame size is _____ bytes. Anything smaller than that should be considered a "runt frame"
64
