Network+ Chapter 9

Which of the following devices are used to connect WANs? Choose all that apply.

server

router

workstation

modem

All the above

What is the term for the individual geographical locations connected by a WAN?

LAN endpoint

Demarc

WAN dewpoint

WAN site

WAN Site

Alexis needed high-bandwidth Internet access She purchased the high-speed package from her cable TV provider, which offered her 500 Mbps download speed and 20 Mbps upload speed. She made sure that her equipment was up-to-date to handle the speed increase. After the modem was installed, she downloaded a software program called Speedtest to confirm that she was getting the speed she was paying for. She tested her connection at different times during the day and discovered that the download speeds she was getting were not always what she paid for. Some days, she would get over 550 Mbps download, while on others she would only get 200 Mbps download. Occasionally, her speed would drop below 100 Mbps, although her upload speed remained between 18 and 20 Mbps. She contacted her carrier to ask about the issue and was told that she was getting the service she paid for. Why are Alexis' speeds fluctuating so much?

Even with the fastest data plans, there is always one factor that slows down the data in a home office. What is it?

the demarc

the last foot

the last mile

the termination point

The last mile

Which type of dedicated WAN connection reserves bandwidth for the sole use of one customer, typically symmetrical bandwidth with similar upload and download speeds, and an SLA (service level agreement)-backed performance guarantee?

MPLS (multiprotocol label switching)

a leased line

direct connection

PoPs (point of presence)

A leased line

Which type of dedicated WAN connection enables multiple types of layer 3 protocols to travel over any one of several connection-oriented layer 2 protocols, allowing any connectivity option for each site that is appropriate while centrally managing bandwidth between each site?

MPLS (multiprotocol label switching)

a leased line

direct connection

PoPs (point of presence)

MPLS (multiprotocol label switching)

Cloud providers often offer attractive SLAs (service-level agreements) based upon their platform's availability. However, the reliability o the WAN connection that links their resources with a company's network is just as important. To this end, organizations generally offer an array of options. What are some of those options? Choose all that apply.

ISP services

VPN (virtual private network)

direct connection

on-prem storage

All the above

What are some of the benefits of an SD-WAN (software-defined wide area network)? Choose all that apply.

zero-touch provisioning

transport agnostic

zero trust network management

AAR (application-aware routing)

A,B and C

What is the purpose of a wireless WAN?

high-throughput, long-distance, digital exchange

high-speed, short-distance, digital exchange

works in the 2.5 GHz spectrum for long-distance connectivity

works in urban environments

high-throughput, long-distance, digital exchange

All cellular networks share a similar infrastructure in which coverage areas are divided into cells. Each cell is served by an array of antennas and its base station. Collectively, what is this setup called?

signal splitter

cellular emitter

antenna array

cell site

Cell site

What factors can determine the size of a cell in cellular service? Choose all that apply.

topology

number of cell towers

population

cellular traffic

A,C and D

4G (fourth generation) cellular service is characterized by an all-IP network for both data and voice transmission. However, speed has been an issue. What generation of cellular service finally brought about true 4G speeds?

LTE-A (LTE-Advanced)

LTE (Long-Term Evolution)

4G-5

LTG (Long-Term Generation)

LTE-A (LTE-Advanced)

What can be considered a disadvantage of satellite Internet access?

Satellite Internet access must have a receiver box.

Satellite Internet access must have a line-of-sight path.

Satellite Internet access is easy to set up in rural areas.

Satellite Internet access can be mobile such as in a car or boat.

Satellite Internet access must have a line-of-sight path.

Compared to other wireless WAN options, satellite services are faster and suffer less latency.

true or false

False

Cells can be misshapen due to a variety of reasons. What are some of those reasons? Choose all that apply.

cellular technology

terrain

EMI (electromagnetic interference)

antenna radiation patterns

All the above

When a mobile device switches to a different antenna, its communication may change frequencies or even carriers between cells. This transition usually occurs without the user's knowledge or awareness. What is this transition called?

handoff

tradeoff

cell transfer

signal splitting

handoff

In order to reach a reasonable level of availability and effectiveness, how must 5G antennas be placed?

close proximity

spaced far apart

line-of-sight

same specifications as 4G antennas

close proximity

Byron is the systems administrator for a midsize company. He has been working with an outside IT firm due to issues with his edge routers. The technician from the IT firm told Byron that they have the same type of router and that Byron needs to update the firmware to get rid of the problem. The odd thing was that the IT technician referred to his router as an "exterior router" and not an "edge router."

Why is that?

Byron was using the wrong router.

The technician misspoke.

An edge router and exterior router can be the same.

Edge routers and exterior routers look identical but are different.

An edge router and exterior router can be the same.

What is the purpose of a routing table?

identifies malfunctioning routers

identifies where hosts are located

identifies which networks are down

identifies who owns other networks

identifies where hosts are located

What protocol is used by edge routers and exterior routers to distribute data outside of autonomous systems?

IGPs

EGPs

distance vector protocol

link state protocol

EGPs

What term is used to describe the rating system used as a tiebreaker when a router determines which route to send data through?

netmask

interface

prefix

metric

Metric

What do the numbers 0.0.0.0 stand for in a routing table? Choose all that apply.

gateway of last resort

default route

MAC address

ARP address

All the above

What is the purpose of an ACL (access control list)?

It establishes routing paths between different networks.

It acts as a filter to instruct the router to permit or deny traffic.

It monitors and analyzes network traffic for performance issues.

It stores configurations of network devices.

It acts as a filter to instruct the router to permit or deny traffic.

Eliana experienced intermittent traffic issues with one of her routers, allowing some traffic that shouldn't be permitted while denying other traffic that should be allowed. What could be causing this issue?

corrupted ACL

missing ACL

misconfigured ACL

malfunctioning router

misconfigured ACL

At what layer of the OSI model do proxy servers manage security?

physical layer

transport layer

network layer

application layer

Application layer

?

?

What type of firewall only protects the computer on which it is installed?

packet-filtering firewall

network-based firewall

next generation firewall

host-based firewall

host-based firewall

Eduardo is responsible for overseeing his company's web server. He purchased a new hardware firewall and now needs to establish some Access Control List (ACL) rules for it. These rules will involve filtering traffic from the web server that is destined for the Internet. Why does Eduardo need to block this outbound traffic from his web server?

to stop bad actors from starting a DoS attack to stop employees from accessing shopping sites to stop employees from accessing FTP sites

to stop worms from spreading

to stop worms from spreading

What type of error causes routers to drop messages without any error feedback?

DNS issues

router misconfiguration

interface error

roaming misconfiguration

router misconfiguration

What command is used to list the router's routing table information?

ping

traceroute

show ip route

ip route

Show ip route

Elliot was experiencing issues with one of his Cisco routers, and used the "show interface" command to inspect the router's status. While examining the link state, he observed that FastEthernet0/2 was administratively down, confirming what he already knew. Now, he needed to identify the error and bring the port back up. What command should Elliot use to bring the port up?

ip config

config sys

no shut

no close

No shut

In the routing table below what does the "D" in line 5 stand for?

S* 0.0.0.0/0 [1/0] via 192.168.1.1

10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks

C 10.1.1.0/24 is directly connected, GigabitEthernet0/1

L 10.1.1.1/32 is directly connected, GigabitEthernet0/1

C 10.1.2.0/24 is directly connected, GigabitEthernet0/2

L 10.1.2.1/32 is directly connected, GigabitEthernet0/2

D 10.2.0.0/16 [90/30720] via 10.1.1.2, 00:00:05, GigabitEthernet0/1

O 10.3.0.0/16 [110/20] via 10.1.2.2, 00:00:10, GigabitEthernet0/2

192.168.0.0/16 is variably subnetted, 2 subnets, 2 masks

C 192.168.1.0/24 is directly connected, GigabitEthernet0/0

L 192.168.1.1/32 is directly connected, GigabitEthernet0/0

protocol (RIP)

static

protocol (EIGRP)

connect

Protocol (EIGRP)

What happens when no matching route exists for a message?

The message will not be able to leave the originating sender's device.

The message will bounce around the network until its TTL (time-to-live) is up.

The message will bounce back to the originating sender.

The message will be dropped.

The message will be dropped.

What are the commands to add a gateway of last resort to a router? Choose all that apply.

ip default-gateway

ip default-network

ip config-gateway

1p route 0.0.0.0 0.0.0.0

B, C and D

What is a common routing problem whereby a message continuously follows the same path without reaching its destination?

asymmetrical loop

missing route

routing loop

asymmetrical routing

routing loop

What is the common routing issue called where NAT (network address translation) and firewalls cannot see traffic in both directions of a conversation, and as a result, they cannot properly apply filtering rules and might incorrectly reject outgoing traffic that should have been approved?

asymmetrical loop

missing route

routing loop

asymmetrical routing

asymmetrical routing

What command displays a router's routing table?

show ip route

show running-config

show ip protocols

show interface

show ip route

What command displays physical and data link layer information about a device's ports?

show ip route

show running-config

show ip protocols

show interface

show interface

Which command displays detailed VLAN configurations for each of a switch's interfaces?

sh ip int br

sh int tr

sh int sw

sh vlan br

sh int sw

Which command displays a concise list of VLAN assignment information on a switch?

sh ip int br

sh int tr

sh int sw

sh vlan br

sh vlan br