Routing Test 1 (Chapters 1-3)
Which dynamic routing protocol was developed to interconnect different Internet service providers?
BGP BGP is a protocol developed to interconnect different levels of ISPs as well as ISPs and some of their larger private clients.
Which routing protocol is limited to smaller network implementations because it does not accommodate growth for larger networks?
RIP Explanation: The RIP protocol was created with a metric that does not support larger networks. Other routing protocols, including OSPF, EIGRP, and IS-IS, scale well and accommodate growth and larger networks.
What is the correct syntax of a floating static route?
ip route 209.165.200.228 255.255.255.248 10.0.0.1 120
What route would have the lowest administrative distance?
Directly connected route
25. What is the effect of configuring the ipv6 unicast-routing command on a router?
to enable the router as an IPv6 router When the ipv6 unicast-routing command is implemented on a router, it enables the router as an IPv6 router. Use of this command also assigns the router to the all-routers multicast group.
An administrator issues the ipv6 route 2001:db8:acad:1::/32 gigabitethernet0/0 2001:db8:acad:6::1 100 command on a router. What administrative distance is assigned to this route?
100 The command ipv6 route 2001:db8:acad:1::/32 gigabitethernet0/0 2001:db8:acad:6::1 100 will configure a floating static route on a router. The 100 at the end of the command specifies the administrative distance of 100 to be applied to the route.
A company has several networks with the following IP address requirements: IP phones - 50 PCs - 70 IP cameras - 10 wireless access points - 10 network printers - 10 network scanners - 2 Which block of addresses would be the minimum to accommodate all of these devices if each type of device was on its own network?
172.16.0.0/24 The network for the PCs would require a subnet mask of /25 in order to accommodate 70 devices. That network could use IP addresses 0 through 127. Phones require a subnet mask of /26 for 50 devices (addresses 128-191). Three /28 networks are needed in order to accommodate cameras, APs, and printers. The network scanner network can use a /30. A block of addresses with a mask of /24 will accommodate this site as the minimum amount needed.
4. What are two functions of a router? (Choose two.)
A router connects multiple IP networks It determines the best path to send packets Routers connect multiple networks, determine the best path to send packets, and forward packets based on a destination IP address.
16. Which two statements correctly describe the concepts of administrative distance and metric? (Choose two.)
Administrative distance refers to the trustworthiness of a particular route Routes with the smallest metric to a destination indicate the best path
19. Which two statements correctly describe the concepts of administrative distance and metric? (Choose two.)
Administrative distance refers to the trustworthiness of a particular route Routes with the smallest metric to a destination indicate the best path
17. Which two parameters are used by EIGRP as metrics to select the best path to reach a network? (Choose two.)
Bandwidth Delay EIGRP uses bandwidth, delay, load, and reliability as metrics for selecting the best path to reach a network.
What is different between IPv6 routing table entries compared to IPv4 routing table entries?
By design IPv6 is classless so all routes are effectively level 1 ultimate routes. Routers running IOS release 15 have link local routing table entries for both IPv4 and IPv6. The selection of both IPv6 routes and IPv4 routes is based on the longest matching prefix. The routing tables of both IPv6 and IPv4 use directly connected interfaces, static routes, and dynamically learned routes.
Which route would be automatically created when a router interface is activated and configured with an IP address?
C 192.168.0.0/24 is directly connected, FastEthernet 0/0
2. 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 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.
10. When a router receives a packet, what information must be examined in order for the packet to be forwarded to a remote destination?
Destination IP address Explain: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.
11. 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.)
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).
Which type of static route that is configured on a router uses only the exit interface?
Directly connected static route
9. What two pieces of information are displayed in the output of the show ip interface brief command? (Choose two.)
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.
5. In order for packets to be sent to a remote destination, what three pieces of information must be configured on a host? (Choose three.)
IP address subnet mask default gateway 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.
What is a characteristic of a static route that matches all packets?
It identifies the gateway IP address to which the router sends all IP packets for which it does not have a learned or static route. A default static route is a route that matches all packets. It identifies the gateway IP address to which the router sends all IP packets for which it does not have a learned or static route. A default static route is simply a static route with 0.0.0.0/0 as the destination IPv4 address. Configuring a default static route creates a gateway of last resort.
Consider the following command: ip route 192.168.10.0 255.255.255.0 10.10.10.2 5 How would an administrator test this configuration?
Manually shut down the router interface used as a primary route.
1. A network administrator enters the command copy running-config startup-config. Which type of memory will the startup configuration be placed into?
NVRAM A router contains four types of memory: RAM - volatile memory used to store the running IOS, running configuration file, routing table, ARP table, as well as serve as a packet buffer ROM - nonvolatile memory used to hold a limited version of the IOS, bootup instructions, and basic diagnostic software NVRAM - nonvolatile memory used to hold the startup configuration file Flash - nonvolatile memory used to hold the IOS and other system files
Which route would be used to forward a packet with a source IP address of 192.168.10.1 and a destination IP address of 10.1.1.1?
O 10.1.1.0/24 [110/65] via 192.168.200.2, 00:01:20, Serial0/1/0
3. Fill in the blank. When a router receives a packet, it examines the destination address of the packet and looks in the ______ table to determine the best path to use to forward the packet.
Routing
Which route is the best match for a packet entering a router with a destination address of 10.16.0.2?
S 10.16.0.0/24 [1/0] via 192.168.0.9
The network administrator configures the router with the ip route 172.16.1.0 255.255.255.0 172.16.2.2 command. How will this route appear in the routing table?
S 172.16.1.0 [1/0] via 172.16.2.2
22. A network administrator configures the interface fa0/0 on the router R1 with the command ip address 172.16.1.254 255.255.255.0. However, when the administrator issues the command show ip route, the routing table does not show the directly connected network. What is the possible cause of the problem?
The interface fa0/0 has not been activated A directly connected network will be added to the routing table when these three conditions are met: (1) the interface is configured with a valid IP address; (2) it is activated with no shutdown command; and (3) it receives a carrier signal from another device that is connected to the interface. An incorrect subnet mask for an IPv4 address will not prevent its appearance in the routing table, although the error may prevent successful communications.
While configuring RIPv2 on an enterprise network, an engineer enters the command network 192.168.10.0 into router configuration mode. What is the result of entering this command?
The interface of the 192.168.10.0 network is sending only version 2 updates.
What occurs next in the router lookup process after a router identifies a destination IP address and locates a matching level 1 parent route?
The level 2 child routes are examined. When a router locates a parent route that matches the destination IP address of a packet, the router will then examine the level 2 child routes contained within it.
What happens to a static route entry in a routing table when the outgoing interface associated with that route goes into the down state?
The static route is removed from the routing table. The static route is removed from the routing table.
What is a disadvantage of using dynamic routing protocols?
They send messages about network status insecurely across networks by default. By default, dynamic routing protocols forward messages across a network without authenticating the receiver or originator of traffic. Static routes increase in configuration complexity as the network grows larger and are more suitable for smaller networks. Static routes also require manual intervention when a network topology changes or links become disabled.
A network administrator configures a static route on the edge router of a network to assign a gateway of last resort. How would a network administrator configure the edge router to automatically share this route within RIP?
Use the default-information originate command Explanation: The default-information originate command instructs a router to propagate the static default route in RIP or OSPF.
A router is configured to participate in multiple routing protocol: RIP, EIGRP, and OSPF. The router must send a packet to network 192.168.14.0. Which route will be used to forward the traffic?
a 192.168.14.0/26 route that is learned via RIP Before the administrative distance of a route is compared, the route with the most specific best match is utilized. The 192.168.14.0/26 network contains the best match to the destination IP address of 192.168.14.20 and thus the 192.168.14.0/26 RIP route is utilized over the EIGRP and OSFP routes, regardless of administrative distance.
24. What are two common types of static routes in routing tables? (Choose two)
a default static route a static route to a specific network There are two common types of static routes in a routing table, namely, a static route to a specific network and a default static route. A static route configured on a router can be distributed by the router to other neighboring routers. However, the distributed static route will be a little different in the routing table on neighboring routers.
A destination route in the routing table is indicated with a code D. Which kind of route entry is this?
a route dynamically learned through the EIGRP routing protocol
Consider the following command: ip route 192.168.10.0 255.255.255.0 10.10.10.2 5 Which route would have to go down in order for this static route to appear in the routing table?
a static route to the 192.168.10.0/24 network The administrative distance of 5 added to the end of the static route creates a floating static situation for a static route that goes down. Static routes have a default administrative distance of 1. This route that has an administrative distance of 5 will not be placed into the routing table unless the previously entered static route to the 192.168.10.0/24 goes down or was never entered. The administrative distance of 5 added to the end of the static route configuration creates a floating static route that will be placed in the routing table when the primary route to the same destination network goes down. By default, a static route to the 192.168.10.0/24 network has an administrative distance of 1. Therefore, the floating route with an administrative distance of 5 will not be placed into the routing table unless the previously entered static route to the 192.168.10.0/24 goes down or was never entered. Because the floating route has an administrative distance of 5, the route is preferred to an OSPF-learned route (with the administrative distance of 110) or an EIGRP-learned route (with the administrative distance of 110) to the same destination network.
Which type of route will require a router to perform a recursive lookup?
an ultimate route that is using a next hop IP address on a router that is not using CEF When Cisco Express Forwarding (CEF) is not being used on a router, a recursive lookup must be performed when a route using a next-hop IP address is selected as the best pathway to forward data.
Which two requirements are used to determine if a route can be considered as an ultimate route in a router's routing table? (Choose two.)
contain an exit interface contain a next-hop IP address An ultimate route is a routing table entry that contains either a next-hop IP address (another path) or an exit interface, or both. This means that directly connected and link-local routes are ultimate routes. A default route is a level 1 ultimate route, but not all ultimate routes are default routes. Routing table entries that are subnetted are level 1 parent routes but do not meet either of the two requirements to be ultimate routes. Ultimate routes do not have to be classful network entries.
What type of route allows a router to forward packets even though its routing table contains no specific route to the destination network?
default route
When would it be more beneficial to use static routing instead of dynamic routing protocols?
on a network where dynamic updates would pose a security risk Dynamic routing protocols are viewed as less secure than static routing because they commonly forward routing information on the same links that data traffic is crossing.
When would it be more beneficial to use a dynamic routing protocol instead of static routing?
on a network where there is a lot of topology changes Dynamic routing protocols consume more router resources, are suitable for larger networks, and are more useful on networks that are growing and changing.
A network administrator has entered a static route to an Ethernet LAN that is connected to an adjacent router. However, the route is not shown in the routing table. Which command would the administrator use to verify that the exit interface is up?
show ip interface brief
6. Which software is used for a network administrator to make the initial router configuration securely?
terminal emulation client software Connecting to the router console port is required for making the initial router configuration. A console cable and terminal emulation software are needed to connect to the console port. SSH, Telnet, and HTTPS could be used to configure a router if the router has been configured with IP addresses and its interface can be reached through the network.
What two pieces of information are needed in a fully specified static route to eliminate recursive lookups? (Choose two.)
the interface ID exit interface the IP address of the next-hop neighbor
Why would a floating static route be configured with an administrative distance that is higher than the administrative distance of a dynamic routing protocol that is running on the same router?
to be used as a backup route By default, dynamic routing protocols have a higher administrative distance than static routes. Configuring a static route with a higher administrative distance than that of the dynamic routing protocol will result in the dynamic route being used instead of the static route. However, should the dynamically learned route fail, then the static route will be used as a backup.
23. 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 The command ip route 0.0.0.0 0.0.0.0 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.
What two tasks do dynamic routing protocols perform? (Choose two.)
update and maintain routing tables network discovery
route source protocol destination network metric administrative distance next hop route timestamp
D (which is EIGRP) 10.3.0.0 21024000 1 172.16.2.2 00:22:15
8. What is a characteristic of an IPv4 loopback interface on a Cisco IOS router?
It is a logical interface internal to the router The loopback interface is a logical interface internal to the router and is automatically placed in an UP state, as long as the router is functioning. It is not assigned to a physical port and can therefore never be connected to any other device. Multiple loopback interfaces can be enabled on a router.
What are two advantages of static routing over dynamic routing? (Choose two.)
Static routing is more secure because it does not advertise over the network. Static routing uses fewer router resources than dynamic routing.
Which two statements are true regarding classless routing protocols? (Choose two.)
sends subnet mask information in routing updates allows for use of both 192.168.1.0/30 and 192.168.1.16/28 subnets in the same topology