直接連結c - 管理距離零
靜態路由s - 簡單網路，易設定
動態路由 - 自動 routing
RIP 120 Routing Information Protocol
↓收斂最慢，易於管理，向量距離算法 Distance Vector (Routing)
↓RIPv2 可支援認證，支援可變動長度子網遮罩 VLSM ( 解決v1用同樣mask, 浪費 IP )
↓
IGRP Interior Gateway Routing Protocol
↓Cisco 自己發明，不支援 VLSM，Metric 法
↓
EIGRP 90 Enhanced Interior Gateway Routing Protocol
↓Enhanced加強IGRP，綜合Distance Vector ,
↓Cisco 自己發明，使用DUAL演算法(不用holddown, 收斂快)
↓
OSPF 110 Open Shortest Path First
多廠支援，使用SPF演算法
trunk非主幹、主幹(Area0, 範圍0-65535)
Which characteristics are representative of a link-state routing protocol? (Choose three.)
連結狀態路由協議典型特徵有哪些？
A. provides common view of entire topology
提供了完整拓撲的普遍觀點
B. exchanges routing tables with neighbors
和鄰居交換路由表
C. calculates shortest path
計算最短路徑
D. utilizes event‐triggered updates
採用事件觸發更新
E. utilizes frequent periodic updates
採用頻繁的定期更新
Answer: ACD
What information does a router running a link-state protocol use to build and maintain its
topological database? (Choose two.)
路由器在運行一個連結‐狀態協議的時候用什麼訊息來建立並且維持它的拓撲資料庫？
A. hello packets
B. SAP messages sent by other routers
其它路由器發來的 SAP 訊息
C. LSAs from other routers
來自其它路由器的 LSAs 訊息
D. beacons received on point‐to‐point links
在點對點連結的信號站接受
E. routing tables received from other link‐state routers
來自其它連結‐狀態路由器的路由表接收
F. TTL packets from designated routers
來自 DR 的封包
Answer: AC
Refer to the exhibit. Two routers have just been configured by a new technician. All interfaces
are up. However, the routers are not sharing their routing tables. What is the problem?
如圖所示。兩台路由器剛由一新技術員完成設定。所有的接口都開啟。然而，路由器沒有共享他們的路由表。什麼問題？
Router2# debug ip rip
RIP protocol debugging is on
Router2#RIP: sending update to 255.255.255.255 via serial0/0 (192.168.2.2)
RIP: build update entries
network 192.168.3.0, metric 1
RIP: sending v1 update to 255.255.255.255 via Ethernet0/0 (192.168.3.1)
RIP: build update entries
network 192.168.2.0, metric 1
RIP: ignored v2 update to 192.168.2.1 (illegal version)
Router2#A. Split horizon is preventing Router2 from receiving routing information from Router1.
水平分割阻止 Router2接收來自Router 1 的訊息
B. Router1 is configured for RIP version 2, and Router2 is configured for RIP version 1.
Router 1 設定成 RIP 版本 2，Router 2設定成 RIP版本 1
C. Router1 has an ACL that is blocking RIP version 2.
Router 1上有訪問控制列表阻止 RIP 版本 2 的訊息
D. There is a physical connectivity problem between Router1 and Router2.
在 Router 1 和 Router 2 之間存在physical 問題
E. Router1 is using authentication and Router2 is not.
Router 1運用了認證而 Router 2 沒有
Answer: B
Refer to the graphic. Host 1 cannot receive packets from Host 2. Assuming that RIP v1 is the
routing protocol in use, what is wrong with the IP configuration information shown?
(Choose two.)
如圖，主機 1 不能收到來自主機 2 的封包。假定路由協議使用的是 RIP v1，根據 IP 設定訊息的顯示，哪出問題了？
A. The fa0/1 interface of router R2 has been assigned a broadcast address.
路由器 R2 的 fa0/1接口被指派了一個廣播地址
B. The fa0/1 network on router R2 overlaps with the LAN attached to R1.
路由器 R2 的 fa0/1接口的宣告（network）被連接到 R1 的區域網覆蓋了
C. Host 2 has been assigned the incorrect subnet mask.
主機 2被指派了一個錯誤的subnet mask
D. Host 1 has been configured with the 255.255.248.0 subnet mask.
主機 1被設定了 255.255.248.0 的subnet mask
E. Host 2 on router R2 is on a different subnet than its gateway.
Answer: BC
Which series of commands will configure router R1 for LAN-to-LAN communication with
router R2? The enterprise network address is 192.1.1.0/24 and the routing protocol in use is
RIP. (Choose three.)
哪一系列命令將設定路由器R1到路由器R2的LAN‐to‐LAN的通信？公司的網路地址使用192.1.1.0/24，並且路由協議使用 RIP
A. R1(config)# interface ethernet 0
R1(config‐if)# ip address 192.1.1.129 255.255.255.192
R1(config‐if)# no shutdown
B. R1(config)# interface ethernet 0
R1(config‐if)# ip address 192.1.1.97 255.255.255.192
R1(config‐if)# no shutdown
C. R1(config)# interface serial 0
R1(config‐if)# ip address 192.1.1.4 255.255.255.252
R1(config‐if)# clock rate 56000
D. R1(config)# interface serial 0
R1(config‐if)# ip address 192.1.1.6 255.255.255.252
R1(config‐if)# no shutdown
E. R1(config)# router rip
R1(config‐router)# network 192.1.1.4
R1(config‐router)# network 192.1.1.128
F. R1(conf ig)# router rip
R1(config‐router)# version 2
R1(config‐router)# network 192.1.1.0
Answer: ADF
A medium-sized company has a Class C IP address. It has two Cisco routers and one non-Cisco router. All three routers are using RIP version 1. The company network is using the block of 198.133.219.0/24. The company has decided it would be a good idea to split the network into three smaller subnets and create the option of conserving addresses with VLSM. What is the best course of action if the company wants to have 40 hosts in each of the three subnets?
一中型公司有一 C 類的 IP 地址。該公司有兩台思科路由器和一台非思科路由器。所有的路由器使用RIP V1。公司的網路使用198.133.219.0/24 地址。公司決定將網路分割成三個小的子網並且考慮使用 VLSM 產生選項。如果公司三個子網中每一個有 40 台主機，該如何安排地址分配最合適？
A. Convert all the routers to EIGRP and use 198.133.219.32/27, 198.133.219.64/27, and 198.133.219.92/27 as the new subnetworks.
將所有的路由器轉化使用 EIGRP，並且三個子網分別為 198.133.219.32/27, 198.133.219.64/27, 和 198.133.219.92/27
B. Maintain the use of RIP version 1 and use 198.133.219.32/27, 198.133.219.64/27, and 198.133.219.92/27 as
the new subnetworks.
保持使用 RIP V1 並且三個子網分別為 198.133.219.32/27, 198.133.219.64/27, 和 198.133.219.92/27
C. Convert all the routers to EIGRP and use 198.133.219.64/26, 198.133.219.128/26, and 198.133.219.192/26 as the new subnetworks.
將所有路由器轉化使用 EIGRP ，並且三個子網分別為 198.133.219.64/26, 198.133.219.128/26, 和 198.133.219.192/26
D. Convert all the routers to RIP version 2 and use 198.133.219.64/26, 198.133.219.128/26, and 198.133.219.192/26 as the new subnetworks.
將所有的路由器轉化使用 RIP V2，並且三個子網分別為 198.133.219.64/26, 198.133.219.128/26, 和 198.133.219.192/26
E.Convert all the routers to OSPF and use 198.133.219.16/28, 198.133.219.32/28, and 198.133.219.48/28 as the new subnetworks.
將所有的路由器轉化使用 OSPF ，並且三個子網分別為 198.133.219.16/28, 198.133.219.32/28, 和 8.133.219.48/28
F. Convert all the routers to static routes and use 198.133.219.16/28, 198.133.219.32/28, and 198.133.219.48/28 as the new subnetworks.
將所有的路由器轉化使用靜態路由，並且三個子網分別為 198.133.219.16/28, 198.133.219.32/28, 和 198.133.219.48/28
Answer: D
Which two statements are true regarding EIGRP? (Choose two.)
關於 EIGRP，下列哪兩個描述是正確的？
A. Passive routes are in the process of being calculated by DUAL.
處於過程中的被動路由器被稱作DUAL
B. EIGRP supports VLSM, route summarization, and routing update authentication.
C. EIGRP exchanges full routing table information with neighboring routers with every update.
每次更新 EIGRP 與相鄰路由器交換所有路由表訊息
D. If the feasible successor has a higher advertised distance than the successor route, it becomes the primary route.
如果可行後繼路由器比後繼路由器有更高的AD 值，那麼它將成為主路由器
E. A query process is used to discover a replacement for a failed route if a feasible successor is not identified from the current routing information.
Answer: BE
Which statements are true about EIGRP successor routes? (Choose two.)
哪兩個狀態是正確的，關於 EIGRP的後繼路由？
A. A successor route is used by EIGRP to forward traffic to a destination.
一個後繼路由是被 EIGRP用來轉發資料流給一個目的地
B. Successor routes are saved in the topology table to be used if the primary route fails.
後繼路由被保存在拓撲表中用來在主路由失效後使用
C. Successor routes are flagged as "active" in the routing table.
後繼路由在路由表中被標識為「active」狀態
D. A successor route may be backed up by a feasible successor route.
一個後繼路由可能做另一條可行的後繼路由的備份
E. Successor routes are stored in the neighbor table following the discovery process.
後繼路由被儲存在帶有發現process的neighbor table中
Answer: AD
A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20514560. Another route is from OSPF with a metric of 782. The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table?
一個路由器學習到三條可能的路由，這三條路由可以被用來到達目的網路。一條路由來自 EIGRP，並且綜合 metric 值為 20524560.另一個路由來自 OSPF，metric 為 782.最後一條路由來自 RIPv2，metric 值為4
由器將把哪個路由放在路由表中？
A. the OSPF route
B. the EIGRP route
C. the RIPv2 route
D. all three routes
E. the OSPF and RIPv2 routes
Answer: B
OSPF routing uses the concept of areas. What are the characteristics of OSPF areas? (Choose three.)
OSPF 路由運用了區域的概念。OSPF 區域有哪些特性？
A. Each OSPF area requires a loopback interface to be configured.
每個 OSPF 區域都要求設定一個loopback
B. Areas may be assigned any number from 0 to 65535.
區域可能被分配從 0到 65535的任意號碼
C. Area 0 is called the backbone area.
區域 0 被稱作為主幹區域
D. Hierarchical OSPF networks do not require multiple areas.
分等級的 OSPF 網路不需要多個區域
E. Multiple OSPF areas must connect to area 0.
多個 OSPF區域必須連接到區域 0
F. Single area OSPF networks must be configured in area 1.
單個的 OSPF 區域必須在區域 1 中設定
Answer: BCE
What are three characteristics of the OSPF routing protocol? (Choose three.)
OSPF 路由協議有哪三個特徵？
A. It converges quickly.
快速收斂
B. OSPF is a classful routing protocol.
OSPF 是一個有類別的路由協議
C. It uses cost to determine the best route.
運用cost來選擇最佳路由
D. It uses the DUAL algorithm to determine the best route.
使用 DUAL 算法選擇最佳路由
E. OSPF routers send the complete routing table to all directly attached routers.
OSPF 路由器向直連路由器發送完整的路由訊息表
F. OSPF routers discover neighbors before exchanging routing information.
OSPF先發現鄰居，然後交換路由訊息
Answer: ACF
Which statements describe the routing protocol OSPF? (Choose three.)
哪個選項能正確描述路由協議 OSPF？
A. It supports VLSM.
OSPF支持 VLSM
B. It is used to route between autonomous systems.
OSPF可以在自製系統中被用來路由
C. It confines network instability to one area of the network.
OSPF在到網路的一個區域中局限於網路的不穩定性
D. It increases routing overhead on the network.
OSPF在網路上增加了overhead 的路由
E. It allows extensive control of routing updates.
OSPF允許大規模的路由更新控制
F. I t is simpler to configure than RIP v2.
OSPF 與 RIPv2 相比，具有更簡單的設定
Answer: ACE
Which of the following describe the process identifier that is used to run OSPF on a router? (Choose two.)
以下哪個描述是用來在路由器上跑 OSPF的？
A. It is locally significant.
是一個本地（區域網）的概念
B. It is globally significant.
是一個全球化（廣域網）的概念
C. It is needed to identify a unique instance of an OSPF database.
在 OSPF資料庫中被需要來標識一個獨一無二的距離
D. It is an optional parameter required only if multiple OSPF processes are running on the router.
如果在一個路由器上多個 OSPFprocess在運行的話，這是一個可選擇參考的命令
E. All routers in the same OSPF area must have the same process ID if they are to exchange routing information.
如果他們改變路由訊息的話，在同一個 OSPF區域的所有路由器必須有同樣的process ID
Answer: AC
Refer to the graphic. R1 is unable to establish an OSPF neighbor relationship with R3. What
are possible reasons for this problem? (Choose two.)
如圖。R1 不能建立與 R3的 OSPF鄰居關係。哪個選項可能是這個問題的原因？
A. All of the routers need to be configured for backbone Area 1.
在主幹區域 1中，所有的路由器需要做設定
B. R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3.
R1 和 R2 是 DR 和 BDR，所以 OSPF將不會建立與 R3 的鄰接關係
C. A static route has been configured from R1 to R3 and prevents the neighbor adjacency from being
established.
從 R1到 R3有一條靜態路由被設定，阻止了鄰居關係的建立
D. The hello and dead interval timers are not set to the same values on R1 and R3.
在 R1和 R3上，Hello和 dead 時間沒有被設置為同樣的值
E. EIGRP is also configured on these routers with a lower administrative distance.
EIGRP 在這些路由器上也以低的管理距離被設定了
F. R1 and R3 are configured in different areas.
R1和 R3被設定為不同的區域
Answer: DF
The internetwork infrastructure of company XYZ consists of a single OSPF area as shown in the graphic. There is concern that a lack of router resources is impeding internetwork performance. As part of examining the router resources, the OSPF DRs need to be known. All the router OSPF priorities are at the default and the router IDs are shown with each router. Which routers are likely to have been elected as DR? (Choose two.)
XYZ 公司的基礎網路設施由一個單一的 OSPF 區域組成，如圖所示。關注的是路由器資源的缺少阻礙了網路的性能。作為路由資源檢查的一部分，OSPF DRs 需要知道。所有的 OSPF路由器的優先級默認並且路由 IDs 在每個路由器上顯示。哪個路由器可能被選舉成為DR?
A. Corp‐1
B. Corp‐2
C. Corp‐3
D. Corp‐4
E. Branch‐1
F. Branch‐2
Answer: DF
Which routing protocols can be used within the enterprise network shown in the diagram? (Choose three.)
在如下圖所示的公司網路中，哪個路由協議可以被使用
A. RIP v1
B. RIP v2
C. IGRP
D. OSPF
E. BGP
F. EIGRP
Answer: BDF
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