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Ethernet Technologies

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
Switch(config)#errdisable detect cause pagp-flap
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

2. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
Dynamic
R = LAN PHY; W = WAN PHY
Switch(config-if)#no switchport
SVI or native routed interface

3. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Half duplex
Switch(config)#errdisable detect cause loopback
SVI
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

4. Enables error-disable for conditions that trigger unicast flood blocking on a port
Switch(config)#errdisable detect cause pagp-flap
They are dropped (ARP throttling)
Switch(config)#errdisable detect cause unicast-flood
The Layer 3 forwarding engine

5. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Multilayer Switching
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
R = LAN PHY; W = WAN PHY

6. What are the default error-disable detection causes?
Enable error-disable for all possible causes
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Cabling specifications for 10 Gigabit Ethernet
Switch(config)#errdisable detect cause bpduguard

7. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Configure the appropriate values manually on both ends of the link
Switch#show errdisable recovery
Logical Operation Unit
Switch(config-if)#shutdown

8. Displays error-disabled recovery timer information
A switch port that has been shut down automatically due to a serious error condition
Switch#show errdisable recovery
Creating the VLAN
Source MAC address; Port of arrival; VLAN; Time stamp

9. What is 1000BASE-CX?
The switch port falls back to default setting of half duplex
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

10. What connectors can be used with GBIC modules?
Down - static access - trunk or tunnel
SC fibre optic or RJ-45 UTP
Switch#show errdisable recovery
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance

11. Displays interface configuration information
Switch#show running-config interface {interface}
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
R = LAN PHY; W = WAN PHY
Half duplex

12. What is ANSI?
American National Standards Institute
Switch#show interfaces status err-disabled
S = Short; L = Long; E = Extra-long
Trunk

13. What tables are maintained by the CEF Layer 3 engine?
Routing table and ARP table
Tunnel
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Switch#show ip cef {interface} [detail]

14. What is the maximum cabling distance for 1000BASE-ZX?
70 km for 9 micron SMF; 100 km for 8 micron SMF
The Layer 3 forwarding engine
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
300 seconds

15. Enables error-disable when a storm control threshold has been exceeded on a port
Switch(config)#errdisable detect cause storm-control
Trunk
Switch(config-if)#switchport mode access
Switch#show interfaces status err-disabled

16. Creates a switched virtual interface (SVI) and enters interface configuration mode
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Switch(config)#interface vlan {vlan-id}
40 km
Multilayer Switching

17. What is the standard for 10 Gigabit Ethernet (10GbE)?
Content-Addressable Memory
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache
IEEE 802.3ae

18. What is 10GBASE-LR/LW?
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Switch(config)#default interface {interface}
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

19. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
Full duplex only
XENPAK - X2 - or SFP+
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
1000BASE-T full duplex followed by 1000BASE-T half duplex

20. Adds a static entry to the MAC address table
SVI
Logical Operation Unit
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
The Discard adjacency

21. Displays a list of all interfaces in an error-disabled state
Switch(config)#errdisable detect cause loopback
Packets that have been truncated before they were fully received
Switch#show interfaces status err-disabled
40 km

22. What is 1000BASE-ZX?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

23. What are the common PMD types for 10 Gigabit Ethernet?
Feature Manager (FM) and Switching Database Manager (SDM)
Source MAC address; Port of arrival; VLAN; Time stamp
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Switch#show cef drop

24. What is the administrative mode of a switch port that is a member of one VLAN?
Static access or dynamic
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
FIB with adjacency table

25. What is the standard for Gigabit Ethernet (1000 Mbps)?
Switch(config-if)#switchport mode access
The Drop adjacency
Static access - trunk - tunnel or dynamic
IEEE 802.3z

26. What is 10GBASE-ER/EW?
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Switch(config)#errdisable detect cause channel-misconfig
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
They are dropped (ARP throttling)

27. What is 100BASE-T2?
Feature Manager (FM) and Switching Database Manager (SDM)
Switch(config-if)#duplex {auto | full | half}
Distributed CEF (dCEF)
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

28. What are the types of layer 3 switched interfaces
Switch(config)#errdisable detect cause security-violation
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Source MAC address; Port of arrival; VLAN; Time stamp
SVI or native routed interface

29. What is the maximum cabling distance for 10GBASE-LR/LW?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
10 km
Switch(config-if)#switchport mode access

30. What denotes the number of times the CEF table has been flushed and regenerated as a whole?
Switch#show running-config interface {interface}
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
The CEF epoch number

31. What denotes the number of times a CEF entry has been updated since the CEF table was created?
The switch port falls back to default setting of half duplex
Switch(config)#errdisable detect cause storm-control
The CEF entry version number
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

32. Adds a description to an interface configuration
SVI or native routed interface
CEF punt
Switch(config-if)#description {string}
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link

33. What is LOU?
Logical Operation Unit
Cisco Express Forwarding
Half duplex
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

34. Displays CEF Drop statistics with number of packets and reason for each line card
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
With a mask value in addition to binary values to decide which keys in a table are relevant
Manually by administratively disabling and re-enabling the port
Switch#show cef drop

35. Enables error-disable for errors related to 802.1x security
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Switch(config)#errdisable detect cause security-violation
IEEE 802.3z
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure

36. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
Forwarding Information Base
Switch(config)#interface range macro {name}
The Punt adjacency
Switch#show interfaces {interface}

37. What happens to subsequent packets destined for FIB entries in CEF glean state?
They are dropped (ARP throttling)
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]

38. What are the Gigabit Ethernet autonegotiation selection priorities?
1000BASE-T full duplex followed by 1000BASE-T half duplex
Value - Mask - and Result (VMR)
The switch port falls back to default setting of half duplex
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

39. What is the default age-out time for stale entries in the CAM table?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
300 seconds
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
When one station transmits at the same time as another on a shared medium

40. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
Carrier Sense Multiple Access Collision Detection
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Switch(config)#errdisable recovery interval {seconds}
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

41. What is a SVI?
ANSI X3T11 FibreChannel
Switched virtual interface (SVI)
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
On

42. Specifies the timer for automatic re-enabling of error-disabled ports
Switch(config-if)#switchport access vlan {vlan}
Switch(config)#errdisable recovery interval {seconds}
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Distributed CEF (dCEF)

43. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Trunk or dynamic
CEF punt
Switch(config)#no ip cef
Switch(config-if)#speed {10 | 100 | 1000 | auto}

44. What is the maximum cabling distance for 1000BASE-LX/LH?
Switch#show interfaces status err-disabled
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
15 metres
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

45. What is unknown unicast flooding?
IEEE 802.3z
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
A station must wait its turn to transmit; it can't transmit and receive at the same time

46. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
15 metres
A switch port that has been shut down automatically due to a serious error condition
Tunnel
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

47. What is 10GBASE-X?
LOU registers
IEEE 802.3ae
Cabling specifications for 10 Gigabit Ethernet
10 km

48. What packets are immediately sent to the CEF Layer 3 engine for further processing?

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49. Enables error-disable when trunking encapsulation is flapping from one type to another
Switch(config)#errdisable detect cause dtp-flap
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Electromagnetic Interference
Switch(config)#errdisable detect cause rootguard

50. What is 1000BASE-SX?
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
From 30 seconds to 86 -400 seconds (24 hours)
Security and QoS ACLs
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)