Chapter 5 Exam (Cisco 1)
What are two potential network problems that can result from ARP operation?
1. On large networks with low bandwidth, multiple ARP broadcasts could cause data communication delays. 2. Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent of intercepting network traffic.
What are the two sizes (minimum and maximum) of an Ethernet frame?
64 bytes and 1518 bytes
What is auto-MDIX?
A feature that detects Ethernet cable type
Which destination address is used in an ARP request frame?
FFFF.FFFF.FFFF
Match the characteristic to the forwarding method: (Each forwarding method will get 3 of the characteristics below: Characteristics:
Forwarding Method cut-through (A) - has low latency cut-through (B) - may forward runt frames cut-through (C) - begins forwarding when the destination address is received
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?
Host A sends out a broadcast of FF:FF:FF:FF:FF:FF. Every other host connected to the switch receives the broadcast and the host D responds with its MAC address.
What statement describes Ethernet?
It defines the most common LAN type in the world.
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?
Logical link control is implement in software and The data link layer uses LLC to communicate with the upper layer of the protocol suite.
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
Fill in the blank. A collision fragment, also known as a ___________ frame, is a frame of fewer than 64 bytes in length.
RUNT
Match the characteristic to the forwarding method: (Each forwarding method will get 3 of the characteristics below: Characteristics:.
Store and Forward: store-and-forwarding (D) - always store the entire frame store-and-forwarding (E) - checks the CRC before forwarding store-and-forwarding (F) - checks the frame length before forwarding.
Which statement is true about MAC addresses?
The first three bytes are used by the vendor assigned OUI
What happens to runt frames received by a Cisco Ethernet switch?
The frame is dropped.
What addressing information is recorded by a switch to build its MAC address table?
The source Layer 2 address of incoming frames
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
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 statement describes a characteristic of MAC addresses?
They must be globally unique.
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
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?
only host B, C, and router R1
Fill in the blank. On a Cisco switch, ____________ memory buffering is used to buffer frames in queues linked to specific incoming and outgoing ports.
port-based
Fill in the blank. ARP ______________ is a technique that is used to send fake ARP messages to other hosts in the LAN. The aim is to associate IP addresses to the wrong MAC addresses.
spoofing
Which switching method uses the CRC value in a frame?
store-and-forward