CCNA 1 - Chapter 5 (Part 1)

created by Karen.ura… on 19 Dec 13

High Tech

Medium level (71% of success) 22 questions - 294 players

Chapter 5 (Part 1)

How are called the first three bytes of the MAC address?

Vendor code or serial number

Vendor assigned OUI

How are called the last three bytes of the MAC address?

Vendor code or serial number

Vendor assigned OUI

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

It is a nondeterministic method.

It scales well under heavy media use.

Which two statements describe features or functions of the logical link control sublayer in Ethernet standards?

(1)Logical link control is implemented in software. (2)The data link layer uses LLC to communicate with the upper layers of the protocol suite.

(1)Logical link control is implemented in software. (2)The LLC sublayer interacts directly with the NIC driver software.

LLC sublayer or MAC sublayer? It constitutes the lower sublayer of the data link layer.

LLC sublayer

MAC sublayer

LLC sublayer or MAC sublayer? It takes the network protocol data, which is typically an IPv4 packet, and adds control information to help deliver the packet to the destination node.

LLC sublayer

MAC sublayer

LLC sublayer or MAC sublayer? It is used to communicate with the upper layers of the application, and transition the packet to the lower layers for delivery.

LLC sublayer

MAC sublayer

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

Is used for timing synchronization

Is used to identify the destination address

Is used as a padding for data

This field (46 - 1500 bytes) contains the encapsulated data from a higher layer, which is a generic Layer 3 PDU, or more commonly, an IPv4 packet. All frames must be at least 64 bytes long.

FCS

Data

Length

______ is used to detect errors in a frame.

FCS

Data

Length

What is the Layer 2 multicast MAC address that corresponds to the Layer 3 IPv4 multicast address 224. 139. 34. 56?

Ff-ff-ff-0b-22-38

01-00-5e-0b-22-38

00-00-00-0b-22-38

Which is a broadcast MAC address?

Ff-ff-ff-ff-ff-ff

01-00-5e-0b-22-38

00-00-00-0b-22-38

Which statement is correct about MAC and IP addresses during data transmission if NAT is not involved?

Destination and source MAC addresses have local significance and change every time a frame goes from one LAN to another.

A packet that has crossed four routers has changed the destination IP address four times.

Which statement is correct about MAC and IP addresses during data transmission if NAT is not involved?

Destination IP addresses in a packet header remain constant along the entire path to a target host.

A packet that has crossed four routers has changed the destination IP address four times.

What is one of the features of ARP?

If a device receiving an ARP request has the destination IPv4 address, it responds with an ARP reply.

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.

What is one of the features of ARP?

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.

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.

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 the frame with a broadcast MAC address.

It will send an ARP request for the MAC address of the default gateway.

What is one of the potential network problems that can result from ARP operation?

On large networks with low bandwidth, multiple ARP broadcasts could cause data communication delays.

Manually configuring static ARP associations could facilitate ARP poisoning or MAC address spoofing.

What is one of the potential network problems that can result from ARP operation?

Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent of intercepting network traffic.

Manually configuring static ARP associations could facilitate ARP poisoning or MAC address spoofing.

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

Shared Memory Buffering

In __________, frames are stored in queues that are linked to specific incoming or outgoing ports.

Port-based Memory Buffering

Shared Memory Buffering

Fill in the blank. The binary number 0000 1010 can be expressed as ______ in hexadecimal.

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