CCNA 2 Chapter 2 Switching Concepts
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| public switched telephone network (PSTN) Page 46 | show 🗑
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| show | The entrance or the way in.
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| show | The exit or the way out.
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| egress port Page 46 | show 🗑
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| show | The port through which a frame enters a switch.
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| MAC address table Page 47 | show 🗑
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| show | Table in memory that stores source MAC addresses and port numbers learned from frames entering the switch. Also called the MAC address table.
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| show | Electronics added to a switch that allow it to have more ports without degrading performance.
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| store-and-forward switching Page 49 | show 🗑
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| cut-through switching Page 49 | show 🗑
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| show | value in the last field of the datagram against its own FCS calculations. The FCS is an error-checking process that helps to ensure that the frame is free of physical and data-link errors.
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| show | Refers to an area of memory used to temporarily store data.
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| show | A switch forwarding characteristic referring to way the cut-through method makes a forwarding decision as soon as it has looked up the destination MAC address of the frame in its MAC address table. The switch does not have to wait for the rest of the frame to enter the ingress port before making its forwarding decision.
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| show | A modified form of cut-through switching in which the switch waits for the collision window (64 bytes) to pass before forwarding the frame. This means each frame will be checked into the data field to make sure no fragmentation has occurred. Fragment free switching provides better error checking than cut-through, with practically no increase in latency.
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| show | Applications that solve complex computational problems using a fast infrastructure connecting super computers and parallel processing techniques.
10 microseconds or less
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| collision domains Page 51 | show 🗑
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| broadcast domains Page 51 | show 🗑
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| show | Switches have high-port densities: 24- and 48-port switches are often just a single rack unit and operate at speeds of 100 Mb/s, 1 Gb/s, and 10 Gb/s. Large enterprise switches may support many hundreds of ports.
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| Automatic buffering | show 🗑
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| show | Fast port speeds
Fast internal switching
Large Frame Buffers
High port density
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| Which port speed will be autonegotiated between a host with a 1 Gbps NIC connecting to a Cisco Catalyst 2960 switch with a 100 Mbps port? | show 🗑
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| Which device separates broadcast domains? | show 🗑
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| What are the special characteristics do LAN switches use to alleviate network congestion? | show 🗑
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| What is one function of a Layer 2 switch? 1. Determines which interface is used to forward a frame based on the destination MAC address 2. Duplicates the electrical signal of each frame to every port 3. Forwards data based on logical addressing 4. Learns the port assigned to a host by examining the destination MAC address | show 🗑
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| What criteria is used by a Cisco LAN switch to decide how to forward Ethernet frames? | show 🗑
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| Which type of address does a switch use to build the MA address table? | show 🗑
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| show | 4. To enhance user bandwidth
6. To isolate traffic between segments
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| A switch has received a frame on an ingress port. What will the switch do if the unicast destination MAC address is in the MAC address table? | show 🗑
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| A switch has received a frame on an ingress port. What will the switch do if the unicast destination MAC address is not in the MAC address table? | show 🗑
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| A switch has received a frame on an ingress port. What will the switch do if the destination MAC address is a broadcast address? | show 🗑
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| Which switching method makes use of the FCS value? | show 🗑
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| show | 2. Cut-though
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| Which statement about half-duplex and full-duplex communication is true? | show 🗑
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| Which network device can be used to eliminate collisions on an Ethernet network? | show 🗑
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| What is the purpose of frame buffers on a switch? | show 🗑
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| Which network device can serve as a boundary to divide a Layer 2 broadcast domain? | show 🗑
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| show | store-and -forward: ensures that the frame is free of physical and data link errors
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| Which type of address does a switch use to build the MAC address table? | show 🗑
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| Which two statements are true about half-duplex and full-duplex communications? (Choose two.) | show 🗑
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| show | The source Mac address and the incoming port
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| What does the term port density represent for an Ethernet switch | show 🗑
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| Which switching method makes use of the FCS value? | show 🗑
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| show | Frame buffering
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| What will a Cisco LAN switch do if it receives an incoming frame and the destination MAC address is not listed in the MAC address table? | show 🗑
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| show | A switch creates many smaller collision domains and a hub increases the size of a single collision domain
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| show | Adding a switch to a network will increase the size of the broadcast domain.
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