Cisco CCNA 1 Chapter 5 2015
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?
0030.a3e5.0401
What is the Layer 2 multicast MAC address that corresponds to the Layer 3 IPv4 multicast address 224.139.34.56?
01-00-5E-0B-22-38
Fill in the blank. The binary number 0000 1010 can be expressed as_____ in hexadecimal.
0A
What is a characteristic of a contention-based access method?
It is a nondeterministic method. Refer to curriculum topic: 5.1.1 Contention-based methods are nondeterministic and do not have the overhead that is found with controlled access methods. They do not track the turns because devices do not take turns to access the media. Contention-based methods do not scale well under heavy use.
Which two functions or operations are performed by the MAC sublayer? (Choose two.)
It is responsible for Media Access Control. It adds a header and trailer to form an OSI Layer 2 PDU. The MAC sublayer is the lower of the two data link sublayers and is closest to the physical layer. The two primary functions of the MAC sublayer are to encapsulate the data from the upper layer protocols and to control access to the media.
Which action is taken by a Layer 2 switch when it receives a Layer 2 broadcast frame?
It sends the frame to all ports except the port on which it received the frame.
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.
What are two potential network problems that can result from ARP operation? (Choose two.)
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.
Fill in the blank. A collision fragment, also known as a ______frame, is a frame of fewer than 64 bytes in length.
RUNT
Which statement is true about MAC addresses?
The first three bytes are used by the vendor assigned OUI.
What is a characteristic of a contention-based access method?
It is a nondeterministic method.
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?
00-60-2F-3A-07-CC Refer to curriculum topic: 5.1.4 The destination MAC address is used for local delivery of Ethernet frames. The MAC (Layer 2) address changes at each network segment along the path. As the frame leaves the web server, it will be delivered by using the MAC address of the default gateway.
Which two statements describe a fixed configuration Ethernet switch? (Choose two.)
A fixed configuration switch may be stackable. The number of ports on the switch cannot be increased.
What statement illustrates a drawback of the CSMA/CD access method?
Collisions can decrease network performance.
Which two statements are correct about MAC and IP addresses during data transmission if NAT is not involved? (Choose two.)
Destination and source MAC addresses have local significance and change every time a frame goes from one LAN to another. Destination IP addresses in a packet header remain constant along the entire path to a target host.
Which destination address is used in an ARP request frame?
FFFF.FFFF.FFFF The purpose of an ARP request is to find the MAC address of the destination host on an Ethernet LAN. The ARP process sends a Layer 2 broadcast to all devices on the Ethernet LAN. The frame contains the IP address of the destination and the broadcast MAC address, FFFF.FFFF.FFFF. The host with the IP address that matches the IP address in the ARP request will reply with a unicast frame that includes the MAC address of the host. Thus the original sending host will obtain the destination IP and MAC address pair to continue the encapsulation process for data transmission.
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?
H1 sends a unicast message to H2, and the switch forwards it directly to H2.
What are two features of ARP? (Choose two.)
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.
Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.)
Logical link control is implemented in software. The data link layer uses LLC to communicate with the upper layers of the protocol suite.
Fill in the blank. The Ethernet ______ sublayer is responsible for communicating directly with the physical layer.
MAC Refer to curriculum topic: 5.1.1Ethernet at the data link layer is divided into two sublayers - the MAC and the LLC sublayers. The LLC sublayer is responsible for communicating with the upper layers, and the MAC sublayer communicates directly with the physical layer.
Which address or combination of addresses does a Layer 3 switch use to make forwarding decisions?
MAC and IP addresses
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??
PC2 will send an ARP reply with its MAC address.
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?
RT1 will send an ARP reply with its own Fa0/0 MAC address.
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 the switches will work at the fastest speed that is supported by both switches. 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 auto-MDIX feature will configure the interfaces eliminating the need for a crossover cable.
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.
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 DLS1(config-if)# endWhat is the administrator configuring?
a routed port
What type of address is 01-00-5E-0A-00-02?
an address that reaches a specific group of hosts Refer to curriculum topic: 5.1.3 The multicast MAC address is a special value that begins with 01-00-5E in hexadecimal. It allows a source device to send a packet to a group of devices.
Fill in the blank. On Ethernet networks, the hexadecimal address FF-FF-FF-FF-FF-FF represents the ____________MAC address.
broadcast Broadcast BROADCAST
How does adding an Ethernet line card affect the form factor of a switch?
by expanding the port density
Which term defines the processing capabilities of a switch by rating how much data can be processed per second?
forwarding rate
What is the purpose of the preamble in an Ethernet frame?
is used for timing synchronization
Which interface command must be entered in a Layer 3 switch before an IPv4 address can be assigned to that interface?
no switchport Refer to curriculum topic: 5.3.3 The no switchport command puts a Layer 3 switch port into Layer 3 mode. The no shutdown command brings an interface up. The switchport command puts a port of a Layer 3 switch in the Layer 2 mode. The ip classless command configures a router to use classless addressing.
When would a switch record multiple entries for a single switch port in its MAC address table?
when another switch is connected to the switch port
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?
shared memory buffering