RSE Chapter 1

Which packet-forwarding method does a router use to make switching decisions when it is using a forwarding information base and an adjacency table? Cisco Express Forwarding flow process fast switching process switching

Cisco Express Forwarding Cisco Express Forwarding (CEF) is the fastest and preferred switching method. It uses a FIB and an adjacency table to perform the task of packet switching. These data structures change with the topology.

What two pieces of information are displayed in the output of the show ip interface brief command? (Choose two.) Layer 1 statuses MAC addresses IP addresses next-hop addresses speed and duplex settings interface descriptions

IP addresses Layer 1 statuses The command show ip interface brief shows the IP address of each interface, as well as the operational status of the interfaces at both Layer 1 and Layer 2. In order to see interface descriptions and speed and duplex settings, use the command show running-config interface. Next-hop addresses are displayed in the routing table with the command show ip route, and the MAC address of an interface can be seen with the command show interfaces.

Refer to the exhibit.What does R1 use as the MAC address of the destination when constructing the frame that will go from R1 to Server B? If the destination MAC address that corresponds to the IPv4 address is not in the ARP cache, R1 sends an ARP request. R1 leaves the field blank and forwards the data to the PC. R1 uses the destination MAC address of S1. The packet is encapsulated into a PPP frame, and R1 adds the PPP destination address to the frame.

If the destination MAC address that corresponds to the IPv4 address is not in the ARP cache, R1 sends an ARP request. Communication inside a local network uses Address Resolution Protocol to obtain a MAC address from a known IPv4 address. A MAC address is needed to construct the frame in which the packet is encapsulated.

What are two functions of a router? (Choose two.) It controls the flow of data via the use of Layer 2 addresses. It provides segmentation at Layer 2. It determines the best path to send packets. It builds a routing table based on ARP requests. A router connects multiple IP networks.

It determines the best path to send packets. It controls the flow of data via the use of Layer 2 addresses. Routers connect multiple networks, determine the best path to send packets, and forward packets based on a destination IP address.

Consider the following routing table entry for R1:D 10.1.1.0/24 [90/2170112] via 209.165.200.226, 00:00:05, Serial0/0/0What is the significance of the Serial0/0/0? It is the interface on R1 used to send data that is destined for 10.1.1.0/24. It is the interface on the final destination router that is directly connected to the 10.1.1.0/24 network. It is the R1 interface through which the EIGRP update was learned. It is the interface on the next-hop router when the destination IP address is on the 10.1.1.0/24 network.

It is the interface on R1 used to send data that is destined for 10.1.1.0/24. The Serial0/0/0 indicates the outgoing interface on R1 that is used to send packets for the 10.1.1.0/24 destination network.

Refer to the exhibit. A network administrator issues the show ipv6 route command on R1. What two conclusions can be drawn from the routing table? (Choose two.) The interface Fa0/1 is configured with IPv6 address 2001:DB8:ACAD:A::12. R1 does not know a route to any remote networks. Packets that are destined for the network 2001:DB8:ACAD:2::54/128 will be forwarded through Fa0/0. Packets that are destined for the network 2001:DB8:ACAD:2::/64 will be forwarded through Fa0/1. The network FF00::/8 is installed through a static route command.

R1 does not know a route to any remote networks. The interface Fa0/1 is configured with IPv6 address 2001:DB8:ACAD:A::12. From the routing table, R1 knows two directly connected networks and the multicast network (FF00::/8). It does not know any routes to remote networks. The entry 2001:DB8:ACAD:A::12/128 is the local host interface route.

Which two statements correctly describe the concepts of administrative distance and metric? (Choose two.) Administrative distance refers to the trustworthiness of a particular route. The value of the administrative distance cannot be altered by the network administrator. The metric varies depending on which Layer 3 protocol is being routed. A router first installs routes with higher administrative distances. The metric is always determined based on hop count. Routes with the smallest metric to a destination indicate the best path.

Routes with the smallest metric to a destination indicate the best path. Administrative distance refers to the trustworthiness of a particular route. A metric is calculated by a routing protocol and is used to determine the best path (smallest metric value) to a remote network. Administrative distance (AD) is used when a router has two or more routes to a remote destination that were learned from different sources. The source with the lowest AD is installed in the routing table.

Which two parameters are used by EIGRP as metrics to select the best path to reach a network? (Choose two.)​ hop count delay bandwidth confidentiality jitter resiliency

bandwidth delay EIGRP uses bandwidth, delay, load, and reliability as metrics for selecting the best path to reach a network.​

When a router receives a packet, what information must be examined in order for the packet to be forwarded to a remote destination? source MAC address destination MAC address destination IP address source IP address

destination IP address When a router receives a packet, it examines the destination address of the packet and uses the routing table to search for the best path to that network.

Which two items are used by a host device when performing an ANDing operation to determine if a destination address is on the same local network? (Choose two.) source MAC address destination MAC address network number subnet mask destination IP address

destination IP address subnet mask The result of ANDing any IP address with a subnet mask is a network number. If the source network number is the same as the destination network number, the data stays on the local network. If the destination network number is different, the packet is sent to the default gateway (the router that will send the packet onward toward the destination network).

In order for packets to be sent to a remote destination, what three pieces of information must be configured on a host? (Choose three.) DHCP server address IP address DNS server address default gateway hostname subnet mask

subnet mask default gateway IP address A host can use its IP address and subnet mask to determine if a destination is on the same network or on a remote network. If it is on a remote network, the host will need a configured default gateway in order to send packets to the remote destination. DNS servers translate names into IP addresses, and DHCP servers are used to automatically assign IP addressing information to hosts. Neither of these servers has to be configured for basic remote connectivity.

A network administrator configures a router by the command ip route 0.0.0.0 0.0.0.0 209.165.200.226. What is the purpose of this command? to provide a route to forward packets for which there is no route in the routing table to forward all packets to the device with IP address 209.165.200.226 to forward packets destined for the network 0.0.0.0 to the device with IP address 209.165.200.226 to add a dynamic route for the destination network 0.0.0.0 to the routing table

to provide a route to forward packets for which there is no route in the routing table The command ip route 0.0.0.0 0.0.0.0 <next hop> adds a default route to the routing table of a router. When the router receives a packet and does not have a specific route toward the destination, it forwards the packet to the next hop indicated in the default route. A route created with the ip route command is a static route, not a dynamic route.