CCNA 1 Chapter 5 Studyguide

On a Cisco switch, __________-________________ memory buffering is used to buffer frames in queues linked to specific incoming and outgoing ports.

Port-Based

What happens to runt frames received by a Cisco Ethernet switch?

The frame is dropped.

Match the 7 fields of an Ethernet frame to their respective contents. (Not all options are used.) What is field 5?

field 5: Length/Type

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

Which switching method uses the CRC value in a frame?

store-and-forward

The binary number 0000 1010 can be expressed as ____ in hexadecimal

A

Which two statements are correct about MAC and IP addresses during data transmission if NAT is not involved? (Choose two.) Destination MAC addresses will never change in a frame that goes across seven routers. 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 IP addresses in a packet header remain constant along the entire path to a target host.

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

What statement describes Ethernet?

It defines the most common LAN type in the world.

ARP ________________________ is a technique that is used to send fake ARP messages to other hosts in the LAN. The aim is associate IP addresses to the wrong MAC addresses.

Spoofing

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? MAC Address Table Port 1: MAC Address :12-34-56-78-9A-BF Port 3: MAC Address: 12-34-56-78-9a-BD PC1: 12-34-56-78-9A-BF PC2: 12-34-56-78-9A BD PC3: 12-34-56-78-9A-BE PC4: 12-34-56-78-9A-BF

The switch will forward the frame to all ports except port 4.

Which statement describes the treatment of ARP requests on the local link?

They are received and processed by every device on the local network

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

What statement illustrates a drawback of the CSMA/CD access method?

Collisions can decrease network performance.

Match the 7 fields of an Ethernet frame to their respective contents. (Not all options are used.) What is field 7?

End of frame-Field 7: Frame Check Sequence

What is a characteristic of a contention-based access method?

It is a nondeterministic method

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.

The ARP table in a switch maps which two types of address together?

Layer 3 address to a Layer 2 address

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 LLC sublayer interacts directly with the NIC driver software. The data link later 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. 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.

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 statement describes a characteristic of MAC addresses?

They must be globally unique.

What is auto-MDIX

a feature that detects Ethernet cable type

Match the characteristic to the forwarding method. cut-through

has low latency may forward runt frames begins forwarding when the destination address is receied

What is the purpose of the preamble in an Ethernet frame?

is used for timing synchronization

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? Router 1----Switch---PC A, PC B, PC C Router 1 is connected to Router 2 with (lightning bolt) Router 2---switch---PC D

only hosts B, C and router R1

What addressing information is recorded by a switch to build its MAC address table?

the source Layer 2 address of incoming frames

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

What are the two sizes (minimum and maximum) of an Ethernet frame? (Choose two.) 56 bytes 64 bytes 128 bytes 1024 bytes 1518 bytes

64 bytes 1518 bytes

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? PC1 (Fa0/1) Connected to SW1 PC2 (Fa0/2) Connected to SW1 SW1 (Fa 0/3) (Fa 0/0) Connected to Router 1 (Fa 0/1) (Fa 0/2) Connected to SW2 SW2 (Fa 0/1) Connected to PC3

PC will send an ARP reply with its MAC address.

Refer to the exhibit. A switch with a default configuration connects four hosts. The ARP table for host A is shown. What happens when host A wants to send an IP packet to host D? switch 1 connected to PC A (10.55.5.8) PC B (10.55.5.9) PC C (10.55.5.10) PC D (10.55.5.11) ARP Table Host A Internet Address 10.55.5.9 10.55.5.10 Physical Address AA:AA:AA:AA:AA:AA BB:BB:BB:BB:BB:BB Type dynamic dynamic

Host A sends out a broadcast of FF:FF:FF:FF:FF:FF. Every other host connected to the switch receives the broadcast and host D responds with its MAC address.

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. 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 device receiving an ARP request has the destination IPv4 address, it responds with an ARP reply. If no device responds to the ARP request, then the originating node will broadcast the data packet to all devices on the network segment.

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 Logical link control is specified in the IEEE 802.3 standard. The LLC sublayer adds a header and a trailer to the data 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 of the media

Logical link control is implemented in software. The data link layer uses LLC to communicate with the upper layers of the protocol suite.

Which address or combination of addresses does a Layer 3 switch use to make forwarding decisions?

MAC and IP addresses

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.

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.

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 auto-MDIX feature will configure the interfaces eliminating the need for a crossover cable. 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. If both switches support different speeds, they will each work at their own fastest speed. The link between switches will work as full-duplex. The link between the switches will work at the fastest speed that is supported by both switches.

The auto-MDIX feature will configure the interfaces eliminating the need for a crossover cable. The link between switches will work as full-duplex. The link between the switches will work at the fastest speed that is supported by both switches.

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

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 What is the administrator configuring?

a routed port

Match the characteristic to the forwarding method store-and-forward

always stores the entire frame checks the CRC before forwarding checks the frame length before forwarding

How does adding an Ethernet line card affect the form factor of a switch?

by expanding the port density

Match the 7 fields of an Ethernet frame to their respective contents. (Not all options are used.) What is beginning of frame- field 1?

field 1: preamble

Match the 7 fields of an Ethernet frame to their respective contents. (Not all options are used.) What is field 2?

field 2: Start Frame Delimiter

Match the 7 fields of an Ethernet frame to their respective contents. (Not all options are used.) What is field 3?

field 3: Destination MAC Address

Match the 7 fields of an Ethernet frame to their respective contents. (Not all options are used.) What is field 4?

field 4: Source MAC Address

Match the 7 fields of an Ethernet frame to their respective contents. (Not all options are used.) What is field 6?

field 6: Encapsulated Data