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27 Cards in this Set
- Front
- Back
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Logical addressing and path selection are a function of protocols from what OSI Layer?
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Layer 3 (Network)
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When PC1 on network A sends data to PC2 on network B via a WAN, what is the largest entity in size that makes it from PC1 to PC2 intact?
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The Packet, or L3PDU
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200.1.1.1 is a valid IP address for which class of network?
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C
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What is the assignable range of values for the first octet for Class A IP networks?
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1 to 126
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When PC1 on network A sends data to PC2 on network B over a WAN, what does Router A do with the data before forwarding it to Router B?
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It strips the Ethernet header and trailer from the frame and reencapsulates it
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What field does a router use when making a decision about where to route TCP/IP packets?
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Destination IP address
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Name two cases in which an IP host would forward packets to its default gateway.
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When the destination IP address is in a different class of network or subnet than the host.
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How do routers learn about routes within their networks?
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By sharing and receiving routing tables from neighboring routers
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Name a protocol in which a PC must retrieve data from a server
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DNS or DHCP
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What term refers to how routing protocols select the best route among many competing routes to the same destination?
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Path Selection
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What Layer 3 field does a router keep from a packet it forwards to store in its IP routing table?
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The Destination IP address
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What routing protocol dynamically learns the data link (or MAC) address of an IP host on its LAN?
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IP Address Resolution Protocol (ARP)
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What adjacent-layer interaction takes place when you send a Layer 3 packet before it reaches the network?
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Layer 2 encapsulates the packet with a Ethernet header and trailer
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How long is an IP address?
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32 bits, or 4 bytes
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What must be true about the IP address of every IP host on a given network?
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The first octet must be the same
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Two IP hosts on the same network will never be separated by what device?
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A router
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What is the network identifier?
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A reserved Dotted-Decimal Notation (DDN) value per network that is used to identify it and cannot be used by an IP host
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What is a Class A network's range and how many octets does each Class A address share?
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1 to 126, One
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What is a Class B network's range and how many octets does each Class B address share?
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128 to 191, Two
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What is a Class C network's range and how many octets does each Class C address share?
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192 to 223, Three
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What is the first step a router performs when it receives a data link frame?
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Check the FCS field for errors; if there are errors, discard the frame
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What is convergence time?
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The time between a router losing a route in its routing table and finding a replacement one
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When a router spreads the information about its routing table to other devices, it sends the data in a...
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Routing update
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What device would your PC contact first before your router when attempting to visit www.google.com?
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A Domain Naming System (DNS) server in your IP network
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What is the purpose of an Address Resolution Protocol (ARP) Request?
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To retrieve the MAC address from an IP host, which generates an ARP reply
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What does a host compare an IP address to in order to find a target host's MAC address?
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The ARP table or ARP cache
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What is an Internet Control Message Protocol (ICMP) echo request known as and what does it test?
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Basic IP connectivity; Whether the network can deliver a packet to the IP host
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